A Snow Siren was a creature living in the mountain of the planet Shingra. Similar to crabs, they hid under the snow and produced plaintive moans to attract voyagers in crevices.[1]
Behind the scenes
The "Snow Siren" is a nickname given to a creature mentioned by Jean Balczesak for the ambiguously canon roleplaying scenario L'écume de l'espace which appeared in the French magazine Casus Belli 44.[1]
Sources
"L'écume de l'espace" — Casus Belli 44 (First mentioned) (Unlicensed)