I am currently re-reading the Fafhrd and Grey Mouser stories by Fritz Leiber. I am particularly fond of the ones set in the Cold Wastes of Nehwon. Many creatures of the Cold Wastes would obviously be at home on the high plateaux of Tibet or in the cold mountains of Western Siberia.
The Snow Serpent is exactly such a creature. Despite its name, it is really a mammal that preys upon unwary travellers and their beasts of burden.
Particularly primitive or superstitious tribes consider the Snow Serpent as a divine animal and avoid killing it. Some others hunt it actively because of the quality and the beauty of its snow-white fur.
The following stats are partially inspired from the Lankhmar supplement for MRQ.
However, after having read the relevant novel, I cannot quite understand why the poison of the Snow Serpent was described as a cloud breathed by the animal or as spat poison. In the novel, Fafhrd is clearly victim to the poison because he's been bitten.
STR 4D6+12 (26)
CON 4D6+6 (20)
SIZ 4D6+12 (26)
INT 7 (7)
POW 3D6 (10-11)
DEX 3D6 (10-11)
Damage bonus: +2D6
Hit Points 23
Hide 80% on a white background, 40% otherwise
Stealth 90% on a white background, 45% otherwise
Bite 50%, damage 1D8+½db (bleeding) + poison (see below).
The poison of the snow serpent has a numbing effect. Its POT is equal to the SIZ of the serpent. If it rolls successfully on the Resistance Table vs the CON of the victim, the affected hit location is useless for 1D6 hours.
Armour: Thick fur 2 points
Hit Location table: Use Snake