Wormspawn Praetorian
Large natural magical beast (undead)
Level 28 Brute XP 13000

Initiative +24        Senses Perception +22; Darkvision
HP 317; Bloodied 158
AC 40; Fortitude 40, Reflex 42, Will 40
Immune disease, poison; Resist 10 necrotic, half damage from melee and ranged attacks; Vulnerable 10 radiant; 10 against close and area attacks
Speed 6

(⚔) Clacking Mandible (standard, at-will)

+31 vs AC; 4d8+4 damage.

⚔ Swarm-Through (move, recharge ⚅

The wormspawn praetorian shifts up to 5 squares and can move through enemies' spaces when doing so. When it enters an enemy's space, it makes an attack; +31 vs AC; 3d12+4 poison damage. The wormspawn praetorian can make no more than one attack against a single creature when using this power.

Swarm Split ( when first bloodied; encounter)

The wormspawn praetorian splits into two Large individuals, the second one occupying a space adjacent to the original creature. Each of the two creatures has hit points equal to one half the original's current hit points. Both creatures act on the original creature's initiative count. Effects applied to the original wormspawn praetorian do not apply to either of the individuals after the split occurs. A wormspawn praetorian can't split if reduced to 0 hit points by the attack that bloodied it.
    If out of combat for 5 minutes, the two halves combine back into one wormspawn praetorian, which has hit points equal to the combined value of the two halves.

Squeezing Swarm

By altering its shape, a wormspawn praetorian can squeeze as if it were a Tiny creature.

Alignment Evil        Languages Common
Str 27 (+22)      Dex 30 (+24)      Wis 26 (+22)
Con 27 (+22)      Int 23 (+20)      Cha 23 (+20)

Published in Open Grave, page(s) 207.