Abolethic Skum
Medium aberrant beast (aquatic, blind, ooze)
Level 18 Minion Brute XP 500

Initiative +13        Senses Perception +14; blindsight 10, tremorsense 10
Psychic Dissonance aura 1; each creature within the aura gains vulnerable 5 psychic damage.
HP 1; a missed attack never damages a minion.
AC 30; Fortitude 32, Reflex 30, Will 26
Immune gaze; Resist 20 acid
Speed 2, swim 8

(⚔) Slam (standard, at-will)

+20 vs Fortitude; 16 damage, and the target is pushed 1 square or slowed until the end of the abolethic skum's next turn.

Aqueous Form

An abolethic skum is invisible while in water.

Alignment Unaligned        Languages -
Str 16 (+12)      Dex 19 (+13)      Wis 11 (+9)
Con 23 (+15)      Int 4 (+6)      Cha 4 (+6)

Published in Monster Manual 2, page(s) 172.