Undeadhunter

This weapon is imbued with magic that can counter and disrupt the magic holding undead together, inflicting great damage.

+7, +7 great mace

A great steel mace
Disrupt undead (special brand)
rN+

Deals special damage to undead but no extra to demonic monsters. If you find it and are already using two-handed maces, it's a good switch for places such as Tomb or Crypt.