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.