Income buildings

There are income buildings for each terrain type. Income buildings are always considered the type of terrain they belong to. For example a saw mill would normally be in a forest, but even when placed on a grass area its considered forest terrain. Income buildings give the owner 10 - 20 gold / turn.Income buildings are by default guarded by a single 1 turn unit. When a hero capture a income building he is awarded with 100 XP.