SRD:Mace of Blood

Mace of Blood: This +3 heavy mace must be coated in blood every day, or its bonus fades away (until the mace is coated again). The character using this mace must make a DC 13 Will save every day it is within his possession or become chaotic evil.

Moderate abjuration; CL 8th; Craft Magic Arms and Armor, creator must be at least 9th level and chaotic evil; Price 16,000 gp.