He's a Mindflayer/Lich alright.
It's just that he doesnt use his spells .. the same thing with mind flayers almost not using their special abilities.
Improved mindflayers use their abilities a bit better and the tactics-mod also gets Alhoon to use his spells. He is not a vampire, definetly a lich.
But if you want to meet vampiric Illiithids, just buy ToB
