Allip

Haunting black specters of those who have been driven to the brink and killed themselves in their madness. They appear as wispy black forms through which ordinary weapons can pass through easily. They constantly babble in rhythmic, madness inducing chants, and their touch can rob you of your wits.

Suggested Strategies
Since Allips are incorporeal, non magical weapons won't effect them. Take them at a distance with magic, or in melee with magically enchanted weapons, but only if you think you can resist their maddening touch.