This uncommon 'dark arts' spell is passed down only through the highest ranks of necromancers, and typically only evil ones at that. It summons a ball of spirits and other foul creatures to surround the target and steal life. The biting mouths that are commonly seen cause rot and decay almost instantly.
Like most spectral rot spells, it also lowers the target's morale.
This spell is particularly useful against larger creatures, and armor provides very little protection against it.