diff --git a/games/age-of-four/data/world/traits/biome_trait_weights.json b/games/age-of-four/data/world/traits/biome_trait_weights.json
new file mode 100644
index 00000000..ec8e404c
--- /dev/null
+++ b/games/age-of-four/data/world/traits/biome_trait_weights.json
@@ -0,0 +1,236 @@
+{
+  "deep_ocean": {
+    "size":         {"tiny": 10, "small": 15, "medium": 25, "large": 30, "huge": 20},
+    "diet":         {"producer": 15, "herbivore": 10, "omnivore": 5, "carnivore": 35, "detritivore": 10, "filter_feeder": 25},
+    "habitat":      {"aquatic": 100},
+    "locomotion":   {"swimming": 85, "sessile": 15},
+    "reproduction": {"r_strategy": 45, "k_strategy": 55},
+    "thermal":      {"cold_blooded": 65, "warm_blooded": 35},
+    "social":       {"solitary": 45, "pack": 15, "herd": 5, "swarm": 25, "colony": 10}
+  },
+  "shallow_ocean": {
+    "size":         {"tiny": 20, "small": 30, "medium": 25, "large": 15, "huge": 10},
+    "diet":         {"producer": 20, "herbivore": 20, "omnivore": 10, "carnivore": 25, "detritivore": 10, "filter_feeder": 15},
+    "habitat":      {"aquatic": 100},
+    "locomotion":   {"swimming": 80, "sessile": 20},
+    "reproduction": {"r_strategy": 55, "k_strategy": 45},
+    "thermal":      {"cold_blooded": 70, "warm_blooded": 30},
+    "social":       {"solitary": 30, "pack": 15, "herd": 10, "swarm": 30, "colony": 15}
+  },
+  "coral_reef": {
+    "size":         {"tiny": 30, "small": 35, "medium": 20, "large": 10, "huge": 5},
+    "diet":         {"producer": 20, "herbivore": 25, "omnivore": 15, "carnivore": 20, "detritivore": 10, "filter_feeder": 10},
+    "habitat":      {"aquatic": 100},
+    "locomotion":   {"swimming": 75, "sessile": 25},
+    "reproduction": {"r_strategy": 60, "k_strategy": 40},
+    "thermal":      {"cold_blooded": 80, "warm_blooded": 20},
+    "social":       {"solitary": 25, "pack": 10, "herd": 5, "swarm": 35, "colony": 25}
+  },
+  "estuary": {
+    "size":         {"tiny": 25, "small": 30, "medium": 25, "large": 15, "huge": 5},
+    "diet":         {"producer": 15, "herbivore": 20, "omnivore": 20, "carnivore": 20, "detritivore": 15, "filter_feeder": 10},
+    "habitat":      {"aquatic": 40, "amphibious": 40, "terrestrial": 10, "aerial": 10},
+    "locomotion":   {"swimming": 45, "walking": 20, "flying": 20, "sessile": 15},
+    "reproduction": {"r_strategy": 55, "k_strategy": 45},
+    "thermal":      {"cold_blooded": 55, "warm_blooded": 45},
+    "social":       {"solitary": 25, "pack": 10, "herd": 15, "swarm": 30, "colony": 20}
+  },
+  "lake": {
+    "size":         {"tiny": 20, "small": 35, "medium": 25, "large": 15, "huge": 5},
+    "diet":         {"producer": 15, "herbivore": 25, "omnivore": 15, "carnivore": 20, "detritivore": 10, "filter_feeder": 15},
+    "habitat":      {"aquatic": 70, "amphibious": 20, "aerial": 10},
+    "locomotion":   {"swimming": 65, "flying": 15, "walking": 10, "sessile": 10},
+    "reproduction": {"r_strategy": 55, "k_strategy": 45},
+    "thermal":      {"cold_blooded": 60, "warm_blooded": 40},
+    "social":       {"solitary": 30, "pack": 10, "herd": 10, "swarm": 30, "colony": 20}
+  },
+  "pond": {
+    "size":         {"tiny": 40, "small": 35, "medium": 20, "large": 5},
+    "diet":         {"producer": 20, "herbivore": 25, "omnivore": 15, "carnivore": 10, "detritivore": 20, "filter_feeder": 10},
+    "habitat":      {"aquatic": 50, "amphibious": 35, "aerial": 15},
+    "locomotion":   {"swimming": 50, "flying": 20, "walking": 15, "sessile": 15},
+    "reproduction": {"r_strategy": 65, "k_strategy": 35},
+    "thermal":      {"cold_blooded": 65, "warm_blooded": 35},
+    "social":       {"solitary": 25, "pack": 5, "herd": 5, "swarm": 40, "colony": 25}
+  },
+  "river": {
+    "size":         {"tiny": 25, "small": 35, "medium": 25, "large": 10, "huge": 5},
+    "diet":         {"producer": 10, "herbivore": 20, "omnivore": 20, "carnivore": 25, "detritivore": 15, "filter_feeder": 10},
+    "habitat":      {"aquatic": 55, "amphibious": 30, "aerial": 15},
+    "locomotion":   {"swimming": 60, "flying": 20, "walking": 10, "sessile": 10},
+    "reproduction": {"r_strategy": 55, "k_strategy": 45},
+    "thermal":      {"cold_blooded": 55, "warm_blooded": 45},
+    "social":       {"solitary": 30, "pack": 15, "herd": 10, "swarm": 30, "colony": 15}
+  },
+  "mangrove": {
+    "size":         {"tiny": 25, "small": 30, "medium": 25, "large": 15, "huge": 5},
+    "diet":         {"producer": 15, "herbivore": 15, "omnivore": 20, "carnivore": 25, "detritivore": 15, "filter_feeder": 10},
+    "habitat":      {"aquatic": 25, "amphibious": 35, "terrestrial": 15, "arboreal": 15, "aerial": 10},
+    "locomotion":   {"swimming": 30, "walking": 25, "climbing": 20, "flying": 15, "sessile": 10},
+    "reproduction": {"r_strategy": 55, "k_strategy": 45},
+    "thermal":      {"cold_blooded": 60, "warm_blooded": 40},
+    "social":       {"solitary": 30, "pack": 10, "herd": 10, "swarm": 30, "colony": 20}
+  },
+  "tropical_rainforest": {
+    "size":         {"tiny": 20, "small": 25, "medium": 25, "large": 20, "huge": 10},
+    "diet":         {"producer": 10, "herbivore": 25, "omnivore": 20, "carnivore": 25, "detritivore": 15, "filter_feeder": 5},
+    "habitat":      {"terrestrial": 35, "arboreal": 35, "aerial": 15, "amphibious": 10, "subterranean": 5},
+    "locomotion":   {"walking": 25, "climbing": 30, "flying": 20, "slithering": 10, "burrowing": 10, "sessile": 5},
+    "reproduction": {"r_strategy": 45, "k_strategy": 55},
+    "thermal":      {"cold_blooded": 40, "warm_blooded": 60},
+    "social":       {"solitary": 25, "pack": 20, "herd": 20, "swarm": 20, "colony": 15}
+  },
+  "tropical_dry_forest": {
+    "size":         {"tiny": 20, "small": 25, "medium": 30, "large": 15, "huge": 10},
+    "diet":         {"producer": 10, "herbivore": 25, "omnivore": 20, "carnivore": 25, "detritivore": 15, "filter_feeder": 5},
+    "habitat":      {"terrestrial": 45, "arboreal": 25, "aerial": 15, "amphibious": 10, "subterranean": 5},
+    "locomotion":   {"walking": 35, "climbing": 20, "flying": 20, "slithering": 15, "burrowing": 5, "sessile": 5},
+    "reproduction": {"r_strategy": 50, "k_strategy": 50},
+    "thermal":      {"cold_blooded": 45, "warm_blooded": 55},
+    "social":       {"solitary": 30, "pack": 20, "herd": 20, "swarm": 15, "colony": 15}
+  },
+  "savanna": {
+    "size":         {"tiny": 15, "small": 20, "medium": 25, "large": 25, "huge": 15},
+    "diet":         {"producer": 10, "herbivore": 30, "omnivore": 15, "carnivore": 25, "detritivore": 15, "filter_feeder": 5},
+    "habitat":      {"terrestrial": 70, "aerial": 15, "subterranean": 10, "amphibious": 5},
+    "locomotion":   {"walking": 50, "flying": 20, "burrowing": 15, "slithering": 10, "sessile": 5},
+    "reproduction": {"r_strategy": 45, "k_strategy": 55},
+    "thermal":      {"cold_blooded": 30, "warm_blooded": 70},
+    "social":       {"solitary": 20, "pack": 25, "herd": 35, "swarm": 10, "colony": 10}
+  },
+  "desert": {
+    "size":         {"tiny": 30, "small": 30, "medium": 20, "large": 15, "huge": 5},
+    "diet":         {"producer": 10, "herbivore": 15, "omnivore": 25, "carnivore": 20, "detritivore": 25, "filter_feeder": 5},
+    "habitat":      {"terrestrial": 55, "subterranean": 25, "aerial": 15, "amphibious": 5},
+    "locomotion":   {"walking": 30, "burrowing": 25, "slithering": 20, "flying": 15, "sessile": 10},
+    "reproduction": {"r_strategy": 60, "k_strategy": 40},
+    "thermal":      {"cold_blooded": 70, "warm_blooded": 30},
+    "social":       {"solitary": 40, "pack": 10, "herd": 5, "swarm": 25, "colony": 20}
+  },
+  "temperate_forest": {
+    "size":         {"tiny": 15, "small": 20, "medium": 30, "large": 25, "huge": 10},
+    "diet":         {"producer": 10, "herbivore": 30, "omnivore": 20, "carnivore": 25, "detritivore": 10, "filter_feeder": 5},
+    "habitat":      {"terrestrial": 45, "arboreal": 25, "aerial": 15, "subterranean": 10, "amphibious": 5},
+    "locomotion":   {"walking": 40, "climbing": 20, "flying": 20, "burrowing": 10, "slithering": 5, "sessile": 5},
+    "reproduction": {"r_strategy": 40, "k_strategy": 60},
+    "thermal":      {"cold_blooded": 30, "warm_blooded": 70},
+    "social":       {"solitary": 25, "pack": 25, "herd": 25, "swarm": 10, "colony": 15}
+  },
+  "temperate_grassland": {
+    "size":         {"tiny": 15, "small": 20, "medium": 25, "large": 25, "huge": 15},
+    "diet":         {"producer": 10, "herbivore": 35, "omnivore": 15, "carnivore": 25, "detritivore": 10, "filter_feeder": 5},
+    "habitat":      {"terrestrial": 65, "aerial": 15, "subterranean": 15, "amphibious": 5},
+    "locomotion":   {"walking": 50, "flying": 20, "burrowing": 15, "slithering": 10, "sessile": 5},
+    "reproduction": {"r_strategy": 45, "k_strategy": 55},
+    "thermal":      {"cold_blooded": 25, "warm_blooded": 75},
+    "social":       {"solitary": 20, "pack": 25, "herd": 35, "swarm": 10, "colony": 10}
+  },
+  "chaparral": {
+    "size":         {"tiny": 25, "small": 30, "medium": 25, "large": 15, "huge": 5},
+    "diet":         {"producer": 10, "herbivore": 20, "omnivore": 25, "carnivore": 20, "detritivore": 20, "filter_feeder": 5},
+    "habitat":      {"terrestrial": 60, "subterranean": 20, "aerial": 15, "amphibious": 5},
+    "locomotion":   {"walking": 35, "burrowing": 20, "slithering": 20, "flying": 15, "sessile": 10},
+    "reproduction": {"r_strategy": 55, "k_strategy": 45},
+    "thermal":      {"cold_blooded": 55, "warm_blooded": 45},
+    "social":       {"solitary": 35, "pack": 15, "herd": 10, "swarm": 25, "colony": 15}
+  },
+  "swamp": {
+    "size":         {"tiny": 20, "small": 25, "medium": 25, "large": 20, "huge": 10},
+    "diet":         {"producer": 10, "herbivore": 15, "omnivore": 20, "carnivore": 25, "detritivore": 20, "filter_feeder": 10},
+    "habitat":      {"amphibious": 35, "terrestrial": 25, "aquatic": 20, "aerial": 15, "subterranean": 5},
+    "locomotion":   {"swimming": 25, "walking": 25, "flying": 20, "slithering": 15, "burrowing": 5, "sessile": 10},
+    "reproduction": {"r_strategy": 55, "k_strategy": 45},
+    "thermal":      {"cold_blooded": 55, "warm_blooded": 45},
+    "social":       {"solitary": 30, "pack": 10, "herd": 10, "swarm": 30, "colony": 20}
+  },
+  "bog": {
+    "size":         {"tiny": 30, "small": 30, "medium": 20, "large": 15, "huge": 5},
+    "diet":         {"producer": 15, "herbivore": 15, "omnivore": 15, "carnivore": 15, "detritivore": 25, "filter_feeder": 15},
+    "habitat":      {"amphibious": 30, "terrestrial": 30, "aquatic": 15, "aerial": 20, "subterranean": 5},
+    "locomotion":   {"walking": 25, "swimming": 20, "flying": 25, "burrowing": 10, "sessile": 15, "slithering": 5},
+    "reproduction": {"r_strategy": 55, "k_strategy": 45},
+    "thermal":      {"cold_blooded": 50, "warm_blooded": 50},
+    "social":       {"solitary": 25, "pack": 10, "herd": 10, "swarm": 35, "colony": 20}
+  },
+  "boreal_forest": {
+    "size":         {"tiny": 10, "small": 20, "medium": 30, "large": 25, "huge": 15},
+    "diet":         {"producer": 10, "herbivore": 30, "omnivore": 20, "carnivore": 25, "detritivore": 10, "filter_feeder": 5},
+    "habitat":      {"terrestrial": 55, "arboreal": 15, "aerial": 15, "subterranean": 10, "amphibious": 5},
+    "locomotion":   {"walking": 45, "climbing": 15, "flying": 20, "burrowing": 10, "slithering": 5, "sessile": 5},
+    "reproduction": {"r_strategy": 35, "k_strategy": 65},
+    "thermal":      {"cold_blooded": 15, "warm_blooded": 85},
+    "social":       {"solitary": 25, "pack": 30, "herd": 25, "swarm": 5, "colony": 15}
+  },
+  "tundra": {
+    "size":         {"tiny": 10, "small": 15, "medium": 25, "large": 30, "huge": 20},
+    "diet":         {"producer": 5, "herbivore": 35, "omnivore": 15, "carnivore": 30, "detritivore": 10, "filter_feeder": 5},
+    "habitat":      {"terrestrial": 70, "aerial": 15, "subterranean": 10, "amphibious": 5},
+    "locomotion":   {"walking": 55, "flying": 20, "burrowing": 15, "slithering": 5, "sessile": 5},
+    "reproduction": {"r_strategy": 35, "k_strategy": 65},
+    "thermal":      {"cold_blooded": 10, "warm_blooded": 90},
+    "social":       {"solitary": 20, "pack": 25, "herd": 40, "swarm": 5, "colony": 10}
+  },
+  "polar_desert": {
+    "size":         {"tiny": 15, "small": 20, "medium": 30, "large": 25, "huge": 10},
+    "diet":         {"producer": 10, "herbivore": 15, "omnivore": 10, "carnivore": 35, "detritivore": 15, "filter_feeder": 15},
+    "habitat":      {"terrestrial": 40, "aquatic": 30, "amphibious": 20, "aerial": 10},
+    "locomotion":   {"walking": 35, "swimming": 30, "flying": 15, "sessile": 15, "burrowing": 5},
+    "reproduction": {"r_strategy": 40, "k_strategy": 60},
+    "thermal":      {"cold_blooded": 10, "warm_blooded": 90},
+    "social":       {"solitary": 35, "pack": 20, "herd": 15, "swarm": 10, "colony": 20}
+  },
+  "montane_forest": {
+    "size":         {"tiny": 10, "small": 20, "medium": 30, "large": 25, "huge": 15},
+    "diet":         {"producer": 10, "herbivore": 30, "omnivore": 20, "carnivore": 25, "detritivore": 10, "filter_feeder": 5},
+    "habitat":      {"terrestrial": 50, "arboreal": 20, "aerial": 15, "subterranean": 10, "amphibious": 5},
+    "locomotion":   {"walking": 40, "climbing": 20, "flying": 20, "burrowing": 10, "slithering": 5, "sessile": 5},
+    "reproduction": {"r_strategy": 35, "k_strategy": 65},
+    "thermal":      {"cold_blooded": 20, "warm_blooded": 80},
+    "social":       {"solitary": 30, "pack": 25, "herd": 20, "swarm": 10, "colony": 15}
+  },
+  "cloud_forest": {
+    "size":         {"tiny": 20, "small": 25, "medium": 25, "large": 20, "huge": 10},
+    "diet":         {"producer": 15, "herbivore": 25, "omnivore": 20, "carnivore": 20, "detritivore": 15, "filter_feeder": 5},
+    "habitat":      {"arboreal": 35, "terrestrial": 30, "aerial": 20, "amphibious": 10, "subterranean": 5},
+    "locomotion":   {"climbing": 30, "walking": 25, "flying": 25, "slithering": 10, "burrowing": 5, "sessile": 5},
+    "reproduction": {"r_strategy": 40, "k_strategy": 60},
+    "thermal":      {"cold_blooded": 35, "warm_blooded": 65},
+    "social":       {"solitary": 25, "pack": 15, "herd": 15, "swarm": 25, "colony": 20}
+  },
+  "alpine_meadow": {
+    "size":         {"tiny": 15, "small": 20, "medium": 30, "large": 25, "huge": 10},
+    "diet":         {"producer": 10, "herbivore": 35, "omnivore": 15, "carnivore": 25, "detritivore": 10, "filter_feeder": 5},
+    "habitat":      {"terrestrial": 65, "aerial": 20, "subterranean": 10, "amphibious": 5},
+    "locomotion":   {"walking": 50, "flying": 25, "burrowing": 15, "sessile": 5, "slithering": 5},
+    "reproduction": {"r_strategy": 40, "k_strategy": 60},
+    "thermal":      {"cold_blooded": 15, "warm_blooded": 85},
+    "social":       {"solitary": 25, "pack": 20, "herd": 35, "swarm": 5, "colony": 15}
+  },
+  "alpine_tundra": {
+    "size":         {"tiny": 15, "small": 20, "medium": 30, "large": 25, "huge": 10},
+    "diet":         {"producer": 10, "herbivore": 30, "omnivore": 10, "carnivore": 30, "detritivore": 15, "filter_feeder": 5},
+    "habitat":      {"terrestrial": 70, "aerial": 20, "subterranean": 5, "amphibious": 5},
+    "locomotion":   {"walking": 50, "flying": 25, "burrowing": 10, "sessile": 10, "slithering": 5},
+    "reproduction": {"r_strategy": 40, "k_strategy": 60},
+    "thermal":      {"cold_blooded": 10, "warm_blooded": 90},
+    "social":       {"solitary": 25, "pack": 25, "herd": 30, "swarm": 5, "colony": 15}
+  },
+  "permanent_ice": {
+    "size":         {"tiny": 20, "small": 25, "medium": 30, "large": 20, "huge": 5},
+    "diet":         {"producer": 15, "herbivore": 10, "omnivore": 10, "carnivore": 30, "detritivore": 15, "filter_feeder": 20},
+    "habitat":      {"aquatic": 35, "terrestrial": 30, "amphibious": 25, "aerial": 10},
+    "locomotion":   {"swimming": 30, "walking": 30, "flying": 15, "sessile": 20, "burrowing": 5},
+    "reproduction": {"r_strategy": 45, "k_strategy": 55},
+    "thermal":      {"cold_blooded": 15, "warm_blooded": 85},
+    "social":       {"solitary": 35, "pack": 15, "herd": 10, "swarm": 15, "colony": 25}
+  },
+  "subterranean": {
+    "size":         {"tiny": 30, "small": 30, "medium": 25, "large": 10, "huge": 5},
+    "diet":         {"producer": 10, "herbivore": 10, "omnivore": 25, "carnivore": 25, "detritivore": 25, "filter_feeder": 5},
+    "habitat":      {"subterranean": 85, "terrestrial": 10, "amphibious": 5},
+    "locomotion":   {"burrowing": 40, "walking": 25, "climbing": 15, "slithering": 15, "sessile": 5},
+    "reproduction": {"r_strategy": 55, "k_strategy": 45},
+    "thermal":      {"cold_blooded": 75, "warm_blooded": 25},
+    "social":       {"colony": 35, "swarm": 25, "solitary": 25, "pack": 10, "herd": 5}
+  }
+}
diff --git a/games/age-of-four/data/world/traits/flavor.json b/games/age-of-four/data/world/traits/flavor.json
new file mode 100644
index 00000000..180e61af
--- /dev/null
+++ b/games/age-of-four/data/world/traits/flavor.json
@@ -0,0 +1,74 @@
+{
+  "biome_prefixes": {
+    "deep_ocean": ["Abyssal", "Trench", "Deep", "Ancient", "Void"],
+    "shallow_ocean": ["Salt", "Tide", "Shore", "Brine", "Coral"],
+    "coral_reef": ["Reef", "Pearl", "Bright", "Shell", "Surge"],
+    "estuary": ["Brackish", "Marsh", "Delta", "Silt", "Murk"],
+    "lake": ["Still", "Mire", "Reed", "Murk", "Silver"],
+    "pond": ["Stagnant", "Puddle", "Scum", "Shallow", "Murk"],
+    "river": ["Current", "Rapid", "Eddy", "Stone", "Rush"],
+    "mangrove": ["Root", "Tangle", "Brackish", "Stilted", "Brine"],
+    "tropical_rainforest": ["Rot", "Canopy", "Vine", "Emerald", "Fang"],
+    "tropical_dry_forest": ["Thorn", "Dry", "Rust", "Ochre", "Husk"],
+    "savanna": ["Sun", "Dust", "Plains", "Ember", "Dry"],
+    "desert": ["Sand", "Dune", "Sun", "Ember", "Bleach"],
+    "temperate_forest": ["Iron", "Moss", "Bark", "Grey", "Amber"],
+    "temperate_grassland": ["Pale", "Wind", "Dust", "Gold", "Steppe"],
+    "chaparral": ["Brush", "Dry", "Thorn", "Smoke", "Amber"],
+    "swamp": ["Bog", "Rot", "Murk", "Bile", "Fen"],
+    "bog": ["Peat", "Mist", "Sour", "Dank", "Haze"],
+    "boreal_forest": ["Frost", "Pine", "Snow", "Ash", "Cold"],
+    "tundra": ["Frost", "Winter", "Howling", "White", "Bitter"],
+    "polar_desert": ["Ice", "Pale", "Frozen", "Null", "Void"],
+    "montane_forest": ["Stone", "Ridge", "Cloud", "Iron", "Crag"],
+    "cloud_forest": ["Mist", "Veil", "Drip", "Shroud", "Dew"],
+    "alpine_meadow": ["Peak", "Wind", "Rime", "Crest", "Cold"],
+    "alpine_tundra": ["Shard", "Frost", "Bare", "Gale", "Scree"],
+    "permanent_ice": ["Glacier", "Null", "White", "Eternal", "Rime"],
+    "subterranean": ["Pale", "Crystal", "Cave", "Blind", "Hollow"],
+    "volcanic": ["Obsidian", "Cinder", "Ash", "Molten", "Slag"]
+  },
+  "biome_motifs": {
+    "deep_ocean": ["bioluminescent markings", "dark scales", "pressure scars", "void-black hide"],
+    "shallow_ocean": ["salt-crusted scales", "coral growths", "tide markings", "pearl sheen"],
+    "coral_reef": ["iridescent scales", "anemone frills", "bright warning colors", "shell fragments"],
+    "estuary": ["mud-streaked hide", "brackish slime coat", "reed camouflage", "silted gills"],
+    "lake": ["reed-pattern camouflage", "silver scales", "murky green tones", "algae patches"],
+    "pond": ["algae-coated skin", "stagnant water film", "dull coloration", "silt deposits"],
+    "river": ["streamlined body", "smooth pebble markings", "current-adapted fins", "stone-grey tones"],
+    "mangrove": ["root-bark texture", "salt-stained hide", "tangled growths", "brackish sheen"],
+    "tropical_rainforest": ["rot-stained markings", "vine-wrapped limbs", "iridescent plumage", "fungal patches"],
+    "tropical_dry_forest": ["cracked bark hide", "ochre dust coating", "thorn protrusions", "dry leaf camouflage"],
+    "savanna": ["dust-caked hide", "sun-bleached mane", "ember-gold eyes", "heat-cracked plates"],
+    "desert": ["sand-worn carapace", "heat shimmer patterns", "bleached bone protrusions", "ember eyes"],
+    "temperate_forest": ["moss patches", "bark texture", "amber eyes", "iron-grey tones"],
+    "temperate_grassland": ["wind-swept fur", "pale hide", "golden tones", "dust markings"],
+    "chaparral": ["smoke-stained fur", "thorn scratches", "dry brush camouflage", "amber resin patches"],
+    "swamp": ["rot-stained hide", "fungal growths", "bile-green tones", "murk camouflage"],
+    "bog": ["peat-dark hide", "mist-damp fur", "sour-water stains", "lichen patches"],
+    "boreal_forest": ["frost-tipped fur", "pine-needle mane", "ash-grey hide", "snow markings"],
+    "tundra": ["thick white pelt", "frost crystals", "wind-scarred hide", "pale eyes"],
+    "polar_desert": ["ice-crusted hide", "translucent frost plates", "snow-blind pale eyes", "void-white fur"],
+    "montane_forest": ["stone-grey hide", "ridge-scarred flanks", "cloud-damp fur", "iron-hard hooves"],
+    "cloud_forest": ["mist-beaded fur", "dripping moss mantle", "veil-like frills", "dew-bright eyes"],
+    "alpine_meadow": ["wind-torn mane", "rime-crusted horns", "crest markings", "cold-hardened hide"],
+    "alpine_tundra": ["frost-sharded scales", "gale-worn hide", "bare rock camouflage", "scree-colored plates"],
+    "permanent_ice": ["glacier-blue veins", "frost armor plates", "snow-crystal growths", "rime-locked joints"],
+    "subterranean": ["translucent skin", "crystalline growths", "eyeless face", "pheromone sacs", "pale fungal patches", "cave-pearl nodules"],
+    "volcanic": ["obsidian plates", "ember-glow cracks", "smoke wisps", "ash-coated hide"]
+  },
+  "subterranean_visual_modes": {
+    "blind": {
+      "motifs": ["smooth eyeless skull", "vibration-sensing barbels", "flattened sensory pits", "pale sunken sockets"],
+      "name_prefixes": ["Blind", "Eyeless", "Pale", "Hollow"]
+    },
+    "echolocation": {
+      "motifs": ["oversized membranous ears", "wide nasal cavity", "flattened sonar face", "sound-focusing horn ridges"],
+      "name_prefixes": ["Shrieking", "Echo", "Wailing", "Sonic"]
+    },
+    "bioluminescent": {
+      "motifs": ["glowing nodules along spine", "phosphorescent stripe patterns", "luminous eye organs", "pulsing light sacs"],
+      "name_prefixes": ["Glowing", "Lantern", "Luminous", "Spark"]
+    }
+  }
+}
diff --git a/games/age-of-four/data/world/traits/trait_constraints.json b/games/age-of-four/data/world/traits/trait_constraints.json
new file mode 100644
index 00000000..1025bafb
--- /dev/null
+++ b/games/age-of-four/data/world/traits/trait_constraints.json
@@ -0,0 +1,20 @@
+{
+  "invalid_pairs": [
+    {"a": "aquatic", "b": "burrowing", "reason": "Cannot burrow underwater"},
+    {"a": "sessile", "b": "carnivore", "reason": "Sessile organisms cannot hunt"},
+    {"a": "aerial", "b": "huge", "reason": "Too heavy for sustained flight"},
+    {"a": "subterranean", "b": "aerial", "reason": "Cannot fly underground"},
+    {"a": "filter_feeder", "b": "terrestrial", "reason": "Filter feeding requires water medium"},
+    {"a": "sessile", "b": "walking", "reason": "Sessile cannot walk"},
+    {"a": "sessile", "b": "flying", "reason": "Sessile cannot fly"},
+    {"a": "sessile", "b": "swimming", "reason": "Sessile cannot swim"},
+    {"a": "arboreal", "b": "aquatic", "reason": "Cannot live in trees and water simultaneously"},
+    {"a": "swarm", "b": "huge", "reason": "Huge organisms cannot swarm, breaks carrying capacity"}
+  ],
+  "special_rules": [
+    {
+      "condition": "locomotion == sessile AND social NOT IN [colony, solitary]",
+      "reason": "Sessile organisms form colonies or live alone, not packs/herds"
+    }
+  ]
+}
diff --git a/games/age-of-four/data/world/traits/trait_definitions.json b/games/age-of-four/data/world/traits/trait_definitions.json
new file mode 100644
index 00000000..443a9973
--- /dev/null
+++ b/games/age-of-four/data/world/traits/trait_definitions.json
@@ -0,0 +1,61 @@
+{
+  "categories": {
+    "size": {
+      "values": ["tiny", "small", "medium", "large", "huge"],
+      "description": "Body mass tier. Affects carrying capacity, predation hierarchy, quality tier."
+    },
+    "diet": {
+      "values": ["producer", "herbivore", "omnivore", "carnivore", "detritivore", "filter_feeder"],
+      "description": "Trophic level. Determines food web position and grazing pressure."
+    },
+    "habitat": {
+      "values": ["aquatic", "terrestrial", "amphibious", "aerial", "subterranean", "arboreal"],
+      "description": "Primary living environment. Constrains tile eligibility and migration paths."
+    },
+    "locomotion": {
+      "values": ["sessile", "walking", "swimming", "flying", "burrowing", "climbing", "slithering"],
+      "description": "Movement mode. Affects migration range and terrain interaction."
+    },
+    "reproduction": {
+      "values": ["r_strategy", "k_strategy"],
+      "description": "Reproductive strategy. r = many offspring, fast growth. k = few offspring, slow growth."
+    },
+    "thermal": {
+      "values": ["cold_blooded", "warm_blooded"],
+      "description": "Thermoregulation. Affects climate tolerance and activity patterns."
+    },
+    "social": {
+      "values": ["solitary", "pack", "herd", "swarm", "colony"],
+      "description": "Group behavior. Affects hunting efficiency, grazing pressure, migration."
+    }
+  },
+  "sub_traits": {
+    "visual_mode": {
+      "description": "Sensory adaptation for subterranean species. Flavor-only, does not affect mechanics.",
+      "applies_to": {"habitat": ["subterranean"]},
+      "values": {
+        "blind": {
+          "weight": 40,
+          "motifs": ["eyeless", "smooth skull plates", "vibration-sensing barbels", "pale sunken sockets"]
+        },
+        "echolocation": {
+          "weight": 35,
+          "motifs": ["oversized ears", "wide nasal cavity", "ultrasonic clicks", "flattened face"]
+        },
+        "bioluminescent": {
+          "weight": 25,
+          "motifs": ["glowing nodules", "phosphorescent stripes", "luminous eyes", "pulsing light organs"]
+        }
+      }
+    }
+  },
+  "quality_tier_formula": {
+    "description": "species_quality = clamp(SIZE_QUALITY[size] + modifiers, 1, 5)",
+    "size_base": {"tiny": 1, "small": 2, "medium": 3, "large": 4, "huge": 5},
+    "modifiers": {
+      "r_strategy": -1,
+      "detritivore": -1,
+      "carnivore": 1
+    }
+  }
+}