Native terrain

Native terrain is a creature's "home" terrain type. It gives creatures fighting in their native terrain +1 attack, +1 defense and +1 speed. Additionally, a hero moving on a terrain that causes movement penalty with only creatures native to that terrain will not suffer movement penalty. Heroes with any creatures native to another terrain will suffer movement penalty. Nomad's sandwalking is the special ability with its own mechanics, not the regular native terrain feature. Creatures on native terrain are able to detect Quicksand and Land Mines. Neutral creatures do not have a native terrain.

Town	Native Terrains
Castle	Grass
Rampart	Grass
Tower	Snow
Inferno	Lava
Necropolis	Dirt
Dungeon	Subterranean
Stronghold	Rough
Fortress	Swamp
Conflux	Grass Highlands
Cove	Swamp

Sieges are always fought on town's native terrain (e.g. Inferno town sieges are fought on lava).

Cove's Grail building Lodestar makes every terrain native to friendly Cove creatures, permanently granting them native terrain benefits.