I just finished Memnoch the devil and like how can it end like that?? This is absolutely preposterous,

Welcome to the fandom. This is how it is. These feels you’re feeling are normal *cackling*

someone please tell me that armand and memnoch aren’t dead!! They can’t be!

YOU CAN’T HANDLE THE CANON. No, j/k, I just don’t want to spoil it for you. Just stay with us. Read/skim the Vampire Armand. 

(BTW, Memnoch is a fallen angel, I don’t think he’s in any kinda danger. You might have meant Mael)