Yeti Lairs are landmarks added by Twilight Forest. They are found in the Snowy Forest biome. There are four entrances that lead into the main area of the lair. One Alpha Yeti will spawn in the Lair and many Yetis will spawn in the Yeti Lair. If the Ur-Ghast has not been slain the Alpha Yeti is invincible and the player is afflicted with Slowness III until they leave the Snowy Forest.
The Yeti Lair from the outside.
Looking into the Yeti Lair. The Alpha Yeti is deep inside, obscured by shadow.