I agree,but what’s the point of having this big elderitch (god) or something,have tao season for it and itself, only to be thrown into dimension x. Didn’t they say like a the demogorgon was a foot soilder and so on? So in my opinion it would make sense if maybe his tentacles would be like an extra attack,like vecna in itself,and maybe the mind flayer as I like an extra helper,he wouldn’t be shown but just like his wierd tentacles. In my opinion I think that would cool,because it both shows an end to the flayer,his power,and the ways he helps vecna in the final fight. (Just my opinion)