"Even other monsters fear him, so expect a clobbering. He shrugs off explosions. Good luck. "
— Quake 1 Manual

a Shambler is a Yeti-like large beast with blood-stained white fur, a very large mouth displaying enormous fangs, no visible eyes, and sharp claws. Its furious melee claw smash does enormous damage, and at a distance, it can attack by projecting a bolt of electricity towards you. Its electricity attack will only work if it sees you when it ends its charging up animation. Otherwise, it'll miss.