An unwholesome abomination scuttles fluidly forth, its shape combining features of both spider and squid under an armor of rugged rock. While stone protuberances gird its upper portions, below it is a thing of angry red flesh and soft pink tendrils. Two gaping orifices full of tiny barbs split its lower body—a mouthlike slit surrounded by numerous narrow red eyes and, above that, an oozing alien aperture.
Speed 40 ft., climb 40 ft.
At will—stone shape
Str 27, Dex 29, Con 20, Int 16, Wis 18, Cha 19
Once every 1d4 rounds, an irlgaunt can violently regurgitate a clot of brittle stone and digestive acids. This gastrolith is treated as a thrown splash weapon with a range increment of 30 feet. In addition to damaging any creature struck (as noted above), any creature within 10 feet of the point where the gastrolith strikes (whether a creature or a grid intersection) takes 1d6 points of acid damage. A gastrolith that misses its target hits a nearby point, just like a normal miss with a splash weapon. An irlgaunt has a separate orifice for ejecting gastroliths. Thus, it can make a ranged attack in addition to all its normal melee attacks.
An irlgaunt can move through any sort of natural difficult terrain at its normal speed while in rocky or subterranean terrain. Magically altered terrain affects an irlgaunt as normal.