Blood Crypt

From Wikipedia of the Dark Brotherhood, an online Star Wars Club
The Blood Crypt

This is a huge sandstone coffin bearing an Ankh in relief on its lid. The crypt is mounted on a stone slab and thus movable. It contains the body of Hr'tan, a K'hamar'an warlord who died long before the demise of its people. Anyone meditating close to the crypt for at least two hours, focussing on battle and violence, will cause the respective person to go into a blood fever, where killing and torturing is their main objective during combat. Thus, it is strictly forbidden to use this artifact during peace time.

With every kill the so enhanced that the user causes, he or she will keep the abilities for ten more minutes, however, this comes at a cost. After the effect has expired, the recipient of the extra ability will fall into a coma, experiencing every injury and every kill he or she has caused during vivid dreams. The psychological pressure of this has caused many weaker users to break down, and has inflicted insanity on others.