The Sword of Kas [Major Artifact]

The vampire Kas was the dreaded lieutenant of Vecna. He used this mighty blade, created by his master, to betray and attack the archlich, cutting off his hand and eye in a terrible battle before Vecna destroyed him. Only his sword survived, and it is said to forever seek vengeance against Vecna. The Sword of Kas is a +6 unholy keen vorpal longsword. It grants the wielder a +10 enhancement bonus to Strength. The sword is intelligent (Int 15, Wis 13, Cha 16, Ego 34) and chaotic evil. It can be used to cast the following spells, once per day each: call lightning (10d6 points of damage, Reflex DC 14 half), blasphemy, and unhallow. Once per week it can be used to slay living.

Source: Dungeon Master’s Guide (version 3.5), page 282.