Climbing: Costs +1 to move to a higher Elevation.
Higher Ground: +1 if target is on a lower Elevation.
Lower Ground: -1 if target is on a higher Elevation.
Plains/Bridges: No effect.
Water: Costs +1 to enter. Your unit takes 1 additional from all attacks.
Forest: Your unit takes 1 fewer from all attacks.
Peaks: Costs +1 to enter. For Missile or Spell Attacks you have unlimited (can target anyone in the Realm).
Village: When entering, heal 4 and replenish your / to full. Worth if occupied at the game's end.
Portals: Enter an unblocked Portal and exit through any other unblocked Portal.
Ballista: Costs +1 to enter. You may then take a second action to Fire the Ballista (Action: Movement).