The Yhetees of the Mountains of Mourn have evolved a specific affinity with the subzero temperatures of their mountain homes. The magical aura of cold that these beasts exhale is enough to freeze the blood of their foes, making them easy prey for the vicious snow-beasts.
Source: Warhammer Fantasy: 7th Edition
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Any model in base contact with one or more Yhetees is at -1 to hit regardless of who they attack. Yhetees cannot be joined by characters due to the effects of this unnatural aura. They are also immune to the effects of Ice Magic.