VAMP.ITM is an undroppable melee weapon used by various Vampire creatures, typically the lower or standard 8-10 Hit Dice varieties. It is placed in one of the creature's "Quick Weapon" slots.
It is considered a magical and +2 enchanted item and deals 1d6 (crushing) damage (adjusted by Strength modifier), with a range of one foot, and speed factor of 0.
It has two effects:
The first is applied on a successful hit to the target. A Level drain effect is initiated upon the target creature, draining two experience levels. There is no resistance or saving throw provided. The item plays an animation on the target - a lighting effect and a color fade. A text string reference is displayed in the combat information screen indicating "Two Levels Drained".
The other effect provided by the item gives the Vampire immunity to the spell Nature's Beauty.