Zairtatil Swarm
Medium natural beast (reptile)
Level 3 Skirmisher XP 150

Initiative +7        Senses Perception +3; low-light vision
Swarm Attack aura 1; the zairtail swarm makes a basic attack as a free action against each enemy that begins its turn in the aura.
HP 40; Bloodied 20
AC 17; Fortitude 13, Reflex 18, Will 16
Resist 5 acid, half damage from melee and ranged attacks; Vulnerable 5 against close and area attacks
Speed 8 can enter or move through an enemy's space without provoking opportunity attacks

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

+8 vs AC; 1d8+4 damage plus ongoing 3 damage.

Alignment Unaligned        Languages -
Str 7 (-1)      Dex 19 (+5)      Wis 14 (+3)
Con 9 (0)      Int 2 (-3)      Cha 8 (0)

Published in Forgotten Realms Campaign Guide, page(s) 280.