Rupture Demon
Small elemental magical beast (demon)
Level 5 Minion Soldier XP 50

Initiative +8        Senses Perception +4; low-light vision
HP 1; a missed attack never damages a minion.
AC 20; Fortitude 16, Reflex 18, Will 16
Speed 6, climb 3 (spider climb)

(⚔) Slimy Extrusion (standard, at-will)

+12 vs AC; 5 damage.

⚔ Enveloping Embrace (standard, encounter)

the target is restrained (save ends), and the rupture demon drops to 0 hit points.

Demonic Infestation ( when the rupture demon drops to 0 hit points) ✦ Healing

The rupture demon erupts in a gory explosion of ichor and tentacles that latch on to a demon within 5 squares of the rupture demon and of level 10 or lower. That demon regains 5 hit points and gains a +2 bonus to melee damage rolls until the end of the encounter. This bonus is cumulative with other demonic infestation bonuses (maximum +10).

Alignment Chaotic evil        Languages Abyssal
Str 15 (+4)      Dex 18 (+6)      Wis 15 (+4)
Con 11 (+2)      Int 4 (-1)      Cha 4 (-1)

Published in Monster Manual 2, page(s) 60.