Board Thread:Lore Discussion/@comment-24267938-20130825082124/@comment-6881629-20130825115228

Even though the Snow Demons have attacked Skyrim and Vvardenfell there still seems to be no description of what they look like.

The problem is contact between Tamriel and Akavir happened so long ago its just legends and as you say depending on whos telling the story the Tsaesci can either be almost snake like Argonians or literally giant snakes (and even top half human bottom half snake).

If you've read the wiki page (and the Blades history) you really know all there is to officially know.