Dire Piranha Swarm
Medium natural beast (aquatic, swarm)
Level 17 Skirmisher XP 1600

Initiative +18        Senses Perception +10
Swarm Attack aura 1; the dire piranha swarm makes a basic attack as a free action against each enemy that begins its turn in the aura.
HP 164; Bloodied 82
AC 31; Fortitude 29, Reflex 32, Will 26
Immune forced movement from melee and ranged; Resist half damage from melee and ranged attacks; Vulnerable 10 against close and area attacks
Speed swim 8 can enter or move through an enemy's space (this movement does not provoke opportunity attacks)

(⚔) Swarm of Teeth (standard, at-will)

+22 vs AC; 2d8+7 damage, or 3d8+7 damage against a bloodied target.

Disperse (immediate interrupt, when hit by a melee or ranged attack; encounter)

The swarm takes half damage from the attack.

Alignment Unaligned        Languages -
Str 14 (+10)      Dex 27 (+16)      Wis 14 (+10)
Con 20 (+13)      Int 1 (+3)      Cha 9 (+7)

Published in Dungeon Magazine 158, page(s) 73.