Blackrazor
Blackrazor is a neutral evil two-handed sword +3 that inflicts 1d10+3 points of damage on a successful melee hit (or 3d6+3 points vs. size L or larger target). Its blade resembles a piece of the night sky studded with strange stars, and carved obsidian stones decorate its sheath. In reality, Blackrazor is an entity of shaped negative energy that revels in absorbing life energy from those it kills.
On any killing blow, Blackrazor sucks out and devours the soul of its victim. This action temporarily adds the dead foe’s total levels or HD to wielder’s, increasing his or her THAC0 and attacks/round accordingly. The user also gains the hit points the victim possessed when fully healthy, and all subsequent damage is applied against these "stolen" hit points first. Victims who have lost their souls to Blackrazor cannot be raised.
The sentient sword, which has an Intelligence score of 17 and an ego rating of 16, communicates with its wielder and any nearby living beings via telepathy. Blackrazor is almost the epitome of an evil weapon, existing solely to feed on power and souls, and no good-aligned party can retain that distinction for long with this weapon in its midst. For every three days the sword remains "unfed," its ego increases by 1 point. When it becomes capable of controlling its wielder, it compels him or her to slay the nearest living creature -- preferably a friend or relative. After feeding on the slain creature’s life force, the sword’s ego returns to 16.
The sword does have one drawback, which it never communicates to any wielder. Should it touch a creature tied to the Negative Material Plane (such as an undead being of any type), it transfers one energy level (with corresponding hit points) from the wielder to the creature attacked. Each and every successful blow sucks yet another level from the sword’s unfortunate owner, and the sword devours its wielder's soul should his or her level reach 0. A character who has lost levels in this manner can regain them only through normal adventuring, via a restoration spell, or by using Blackrazor to steal twice as many levels from other living creatures as they lost.
Blackrazor has an XP value of 8,000.