Plaguechanged Gibberling Bunch
Medium natural humanoid (swarm)
Level 6 Brute XP 200

Initiative +7        Senses Perception +8; Darkvision
Gibberling aura 10; enemies in the aura take a -2 penalty to all defenses. Gibberlings can't surprise creatures that aren't deafened.
Swarm Attack aura 1; a plaguechanged gibberling bunch makes a basic attack as a free action against each enemy that begins its turn in the aura.
HP 87; Bloodied 43
AC 19; Fortitude 18, Reflex 19, Will 15
Immune bluefire burst, charm, fear; Resist half damage from melee and ranged attacks; Vulnerable +5 damage from close and area attacks
Speed 6 (If a plaguechanged gibberling bunch is exposed to sunlight, it is slowed until the end of the attacker's next turn.)

(⚔) Swarming Bite (standard, at-will) ✦ Force

+9 vs AC; 4d4+4 damage. Critical Hit: The target takes an extra 1d6 force damage (save ends).

⚔ Pull Down (standard, at-will)

+9 vs Fortitude; 1d4+1 damage, and the target is knocked prone.

ᗕ Bluefire Burst (standard, at-will)

Close burst 2; +6 vs Reflex; 1d4+3 force damage, and the target is slowed (save ends).

Stay Down

A bunch can make opportunity attacks against adjacent targets that stand from prone.

Bone Stripping

A bunch deals an extra 2d4 damage against prone targets.

Alignment Chaotic evil        Languages -
Str 12 (+4)      Dex 18 (+7)      Wis 10 (+3)
Con 17 (+6)      Int 8 (+2)      Cha 2 (-1)

Published in Forgotten Realms Campaign Guide, page(s) 257.