Anti-matter vortex

Anti-matter vortex
The anti-matter vortex is a new monster in UnNetHack and Nethack Brass The anti-matter vortex is a very dangerous monster to encounter if one lacks disintegration resistance. Any weapon that hits it will be disintegrated, as well as the armor, and eventually body of anyone who is engulfed by it.

Strategy
If the player does not have disintegration resistance, use Elbereth and teleport away, or use attack spells. Anything you hit it with will be disintegrated, so don't use ranged weapons unless you don't mind them being destroyed.