Defiled Ground

The dead do not always rest in peace. Some cemeteries are darker than others, and ancient events leave unseen traces of their former presence. Defiled ground sometimes attracts undead.

    Effect: Undead gain a +1 bonus to rolls to recharge their powers while on defiled ground. In addition, if an undead creature is reduced to 0 hit points while on defiled ground, roll a d20; on a 10 or higher, the undead creature rises with 1 hit point on its next turn. If radiant damage reduces an undead creature to 0 hit points, it can’t rise again in this manner.
    Usage: Defiled ground makes undead encounters somewhat more dangerous. Use it for encounters that are meant to have a feel of horror, or to evoke the atmosphere of a site sacred to undead, such as a temple to Orcus.

Published in Dungeon Master's Guide 2, page(s) 59, Dungeon Master's Kit, page(s) 210.