diff --git a/games/age-of-four/data/terrain/frozen.json b/games/age-of-four/data/terrain/frozen.json
index 8175ddf2..66d7fb29 100644
--- a/games/age-of-four/data/terrain/frozen.json
+++ b/games/age-of-four/data/terrain/frozen.json
@@ -26,7 +26,7 @@
         "spell_school": "aether",
         "enchantment_duration_modifier": 2.0
       },
-      "albedo": 0.8,
+      "albedo": 0.85,
       "evapotranspiration": 0,
       "description": "Frozen ocean surface. Impassable to civilians. Aether dominates the polar expanse."
     }
diff --git a/games/age-of-four/data/terrain/land_common.json b/games/age-of-four/data/terrain/land_common.json
index 3ee006ef..1d2bc628 100644
--- a/games/age-of-four/data/terrain/land_common.json
+++ b/games/age-of-four/data/terrain/land_common.json
@@ -28,8 +28,8 @@
         "spell_cost_modifier": -0.10,
         "spell_school": "life"
       },
-      "albedo": 0.35,
-      "evapotranspiration": 0,
+      "albedo": 0.22,
+      "evapotranspiration": 0.005,
       "description": "Open grasslands. Good food production and some trade."
     },
     {
@@ -55,8 +55,8 @@
       "climate_zone": "dry temperate",
       "quality_bonuses": { "production": 1 },
       "terrain_power": {},
-      "albedo": 0.38,
-      "evapotranspiration": 0,
+      "albedo": 0.30,
+      "evapotranspiration": 0.003,
       "description": "Dry open plains. Balanced food and production. Fire aftermath terrain."
     },
     {
@@ -87,8 +87,8 @@
       "terrain_power": {
         "enchantment_duration_modifier": 1.0
       },
-      "albedo": 0.4,
-      "evapotranspiration": 0,
+      "albedo": 0.28,
+      "evapotranspiration": 0.004,
       "description": "Rolling highlands. Strong defensive position with some mining potential."
     },
     {
@@ -119,7 +119,7 @@
         "spell_school": "chaos",
         "enchantment_duration_modifier": 1.0
       },
-      "albedo": 0.6,
+      "albedo": 0.55,
       "evapotranspiration": 0,
       "description": "Towering peaks. Nearly impregnable but barren. Chaos mana converges here."
     },
@@ -149,8 +149,8 @@
         "spell_cost_modifier": -0.20,
         "spell_school": "chaos"
       },
-      "albedo": 0.3,
-      "evapotranspiration": -0.01,
+      "albedo": 0.45,
+      "evapotranspiration": -0.005,
       "description": "Barren sands. No food but useful trade routes. Chaos and Death mana simmers here."
     },
     {
@@ -179,8 +179,8 @@
         "enchantment_duration_modifier": 2.0,
         "spell_school": "aether"
       },
-      "albedo": 0.5,
-      "evapotranspiration": 0,
+      "albedo": 0.35,
+      "evapotranspiration": 0.001,
       "description": "Frozen plains. Harsh climate yields little sustenance. Aether winds persist here."
     }
   ]
diff --git a/games/age-of-four/data/terrain/land_forest.json b/games/age-of-four/data/terrain/land_forest.json
index 8309e30a..598b6fa9 100644
--- a/games/age-of-four/data/terrain/land_forest.json
+++ b/games/age-of-four/data/terrain/land_forest.json
@@ -28,8 +28,8 @@
         "unit_effect_value": 10,
         "spell_school": "nature"
       },
-      "albedo": 0.35,
-      "evapotranspiration": 0.01,
+      "albedo": 0.15,
+      "evapotranspiration": 0.012,
       "description": "Temperate hardwood forest. Good cover and production. Nature mana lingers in the canopy."
     },
     {
@@ -55,12 +55,11 @@
       "climate_zone": "tropical",
       "quality_bonuses": { "food": 1 },
       "terrain_power": {
-        "corruption_spread_modifier": 0.5,
         "spell_school": "nature"
       },
-      "albedo": 0.3,
-      "evapotranspiration": 0.02,
-      "description": "Dense tropical canopy. Bountiful food, heavy cover. Slows corruption and resists fire."
+      "albedo": 0.12,
+      "evapotranspiration": 0.025,
+      "description": "Dense tropical canopy. Bountiful food, heavy cover. Resists fire."
     },
     {
       "id": "boreal_forest",
@@ -88,8 +87,8 @@
         "spell_school": "aether",
         "enchantment_duration_modifier": 1.0
       },
-      "albedo": 0.35,
-      "evapotranspiration": 0.005,
+      "albedo": 0.20,
+      "evapotranspiration": 0.006,
       "description": "Cold conifer forest. High production and timber trade. Aether winds channel through the spires."
     },
     {
@@ -122,7 +121,7 @@
         "archon_mana_regen": 2,
         "adjacent_forest_quality_bonus": true
       },
-      "albedo": 0.5,
+      "albedo": 0.18,
       "evapotranspiration": 0.015,
       "ley_anchor_strength": 1,
       "ley_anchor_school": "nature",
diff --git a/games/age-of-four/data/terrain/land_special.json b/games/age-of-four/data/terrain/land_special.json
index b38f44fd..ff835f36 100644
--- a/games/age-of-four/data/terrain/land_special.json
+++ b/games/age-of-four/data/terrain/land_special.json
@@ -25,11 +25,10 @@
       "terrain_power": {
         "unit_effect": "undead_regen",
         "unit_effect_value": 2,
-        "corruption_spread_modifier": 1.5,
         "spell_school": "death"
       },
-      "albedo": 0.3,
-      "evapotranspiration": 0.005,
+      "albedo": 0.18,
+      "evapotranspiration": 0.008,
       "description": "Murky wetlands. Death mana saturates the stagnant water. Undead thrive here."
     },
     {
@@ -60,7 +59,7 @@
         "spell_school": "chaos",
         "enchantment_duration_modifier": 1.5
       },
-      "albedo": 0.2,
+      "albedo": 0.15,
       "evapotranspiration": 0,
       "description": "Active volcanic terrain. Chaos mana erupts alongside lava. Death rituals yield double here."
     },
@@ -92,7 +91,7 @@
         "unit_effect": "healing_regen",
         "unit_effect_value": 0
       },
-      "albedo": 0.7,
+      "albedo": 0.80,
       "evapotranspiration": 0,
       "description": "Snow-covered terrain. Aether and faint Life mana preserve those who brave the cold."
     }
diff --git a/games/age-of-four/data/terrain/water_and_wonders.json b/games/age-of-four/data/terrain/water_and_wonders.json
index 5a4f8526..ea919c88 100644
--- a/games/age-of-four/data/terrain/water_and_wonders.json
+++ b/games/age-of-four/data/terrain/water_and_wonders.json
@@ -26,7 +26,7 @@
         "spell_school": "aether",
         "enchantment_duration_modifier": 1.0
       },
-      "albedo": 0.35,
+      "albedo": 0.08,
       "evapotranspiration": 0,
       "description": "Shallow coastal waters. Good for fishing and coastal trade. Aether flows freely here."
     },
@@ -56,7 +56,7 @@
         "spell_school": "aether",
         "enchantment_duration_modifier": 1.0
       },
-      "albedo": 0.4,
+      "albedo": 0.06,
       "evapotranspiration": 0,
       "description": "Deep waters. Naval units only. Aether saturates the open sea."
     },
@@ -85,12 +85,11 @@
       "terrain_power": {
         "unit_effect": "healing_regen",
         "unit_effect_value": 1,
-        "spell_school": "aether",
-        "corruption_spread_modifier": 0.5
+        "spell_school": "aether"
       },
-      "albedo": 0.3,
+      "albedo": 0.08,
       "evapotranspiration": 0,
-      "description": "Freshwater lake. Rich fishing and clean water. Purification resists corruption."
+      "description": "Freshwater lake. Rich fishing and clean water."
     },
     {
       "id": "inland_sea",
@@ -118,7 +117,7 @@
         "spell_school": "aether",
         "enchantment_duration_modifier": 1.0
       },
-      "albedo": 0.35,
+      "albedo": 0.08,
       "evapotranspiration": 0,
       "description": "A vast enclosed body of freshwater. Supports trade and fishing like a miniature ocean."
     },