The acid shambler was one of the many horrors spawned in the aftermath of the Divine War, as the wild energies released by the titan’s defeat and imprisonment warped the living — and unliving — matter in their vicinity and gave rise to whole new races of loathsome monsters. They are corpses brought back to horrific, agonizing life by a strange transformation of their blood. The thick reddish-black ichor that surges through their dead veins both animates and deteriorates them from the inside out due to its highly acidic properties. Because of the acid shamblers’ transformation, their limited existence generally lasts only a number of days before the acid destroys them. Even well armed soldiers have fallen as the shamblers’ corrosive blood eats away at the toughest swords and armor with frightening speed.

Acid shamblers lash out, without hesitation or desire for survival, at all living creatures they encounter. Driven by pain and hatred of what they have become, these creatures are mindless killers, and the fact that they often travel in packs makes them exceedingly dangerous to unprepared or ill-equipped opponents. They will use their acidic vomit whenever they can attack two or more creatures.

(From Scarred Lands Creature Collection (p4) - Onyx Path Publishing)