This is a very dangerous spell for the ennemy AND the caster. It creates a black bastard sword (who hovers in the air) that attacks when the caster wishes. It is considered as a +2 magic weapon for the purpose of hitting. The mage uses his basic ThaC0 to hit but has the +2 bonus (he doesn't have any other bonus to hit). The speed of the sword is 3 (for melee combat).
The sword does 1d4 damage/3 levels to the target by succing his life energy (to the maximum of the creature being hit). The damages dealed are given to the mage.But, for maintaning itself, the sword also takes 5 hit points from his master.
NOTES: Only living beings are affected by this spell. If not, the mage loses 5 HP per hit(as the spell). The mage must concentrate for using the sword (no spellcasting!). If he doesn't, the sword won't attack and will deal the 5 HP loss to the caster (but the mage can cast a spell if he beats the sword initiative).