Grotto - Allows the guest hero to sacrifice creatures or artifacts, gaining experience.
Thieves' Guild - Opens 2 additional levels of information in Thieves' Guild, provides towns and garrisons information on enemy towns.
Shipyard - Enables town to build a boat. Can only be built if town is adjacent to water.
Lodestar - Grail building of Cove. Brings 5000 gold per day, multiplies the growth of creatures by 1.5 per week (rounded down). Makes any terrain native to Cove (movement without penalty, +1 to attack, defense and speed, see and ignore mines and see quicksand). Cove's siege remains on swamp.