So, we have all probably heard several theories of what the Tsaesci really are. Being in Akavir, we can't exactly see for ourselves. The theories range from them being huge snakes that devour things and gain the ability to transform into them, to half-snake half-man looking beings with the same abilities, all the way to being entirely men. Is there any evidence that clearly pins them down as one of these three or some other form?

I like to think a Tsaesci's appearance is based on the amount of blood they drink, sorta like how an Argonian's appearance becomes more human-like as they ingest more Hist sap.

I've always viewed the Tsaesci as something like the Yuan'ti from Dungeons and Dragons, running the gambit from almost human, to half-snake, cobra headed abominations. I of course have never had any evidence for that image, but it seemed to fit with their supposedly fearful appearance, and at the same time their ability to blend in with Tamriel's races after their armies defeat. of course, in carrying on with that assumption, i've also always imagined the social structure of the Tsaesci to be somewhat similar to, say, the Volkair Vampires. By that, i mean, the 'blood starved' less humanoid forming the upper echelons of power, reveling in the power which their abstinence grants them and lording over their underlings ruthlessly.

That's a cool theory. I've wondered if the Tsaesci are some sort of soul vampires, so instead of drinking blood they devour souls in a dragonborn like manner. Supposedly Chevalier Renald, the Breton turncoat sorcerer, was a Blade of akaviri origin blessed by immortal snake vampire blood and possessed a human appearance.