Yeti

Nearly a myth, a yeti is rarely seen—and even when it is, it is often too late. Yetis dwell amid the highest, most remote peaks of the world, coming down from their snowy mountain holds to raid, steal livestock, and sometimes feed their insatiable urges for slaughter and destruction. Those folks who live at the foot of a yeti-ruled mountain warn of the "abominable snowmen": monstrous, furcovered humanoids who leave strange and bloody tracks in the snow.

In actuality, most yetis protect the world rather than hunt its other denizens, guarding eldritch portals that link the mortal Universe and other, much stranger dimensions of reality. From within these snow-covered arches and ancient stone doorways, aliens, living nightmares, fiends, and worse can emerge into the world. Yetis who guard these portals sometimes succumb to the horrors within, taking on the bloodthirsty urges and horrific behaviors of the very monsters they strive to guard against. Driven out of their clans and forced to wander alone, they give rise to the myth of the abominable snowman. These exiled yetis often fully embrace the corrupting elements that caused their exile in the first place, growing more powerful and more deadly.