Crypt

The Crypt is your "den" for undead units. It is used to spawn Ghosts, Wraiths, and Vampires. Note: Vampires do not require two beds for each unit, as previously reported, they just need one.

To create a Crypt you need the Dungeon Mastery research No Rest for the Dead, which costs 15,000 research points.

Tile Cost: 800 Gold Per Tile Bonus: 1% Undead Maximum Happiness Per Tile Bonus(Level 4+): 1% Undead Attack, 1% Undead Defense Benefits of increasing level replace the previous level and stack with the bonus from tiles.

Requirements
Research: No Rest for the Dead Room: Temple Level 3