The official GemStone IV encyclopedia.
Standing almost twelve feet tall, the yeti is a large humanoid creature covered in long, stringy black and red hair. His domed pate is matted with twigs and dirt, and his heavy brow forms a shelf over his tiny black eyes. With arms nearly long enough to brush the ground, the yeti has a ferociously strong grip and excellent leverage for the tossing of heavy objects. Broad, flat feet provide stability and traction in the icy, mountainous environments that are his normal habitat.
Hunters familiar with the tactics of glacial morphs will find yeti very familiar. They do employ some maneuver attacks similar to bearhugs and one that is similar to Hurl Boulder (510), but all in all, are the least dangerous creatures found in the Griffin's Keen, if proper care is taken.
Yetis can be stunned, knock them down with Unbalance or hit them in the leg with Limb Disruption. Get them stunned and down on the ground. They have no ability to break stuns.
Yetis tend to eat the dead:
A yeti grabs your right arm and twists it off and begins to slowly chew on his latest meal. Quickly tiring of the gamey meat, he tosses it to the ground.
Blood seeps out of a chewed on elf arm, pieces of cartilage and bone protruding from the end that was once attached to a body.