Mind flayer

Brain squid people, have all been evil so far

Mind flayers, also known as illithids , are sadistic aberrations feared by sentient creatures on many worlds across the multiverse due to their powerful psionic abilities. From their twisted lairs deep in the Underdark, these alien entities seek to expand their dominion over all other lifeforms, controlling their minds to use them as obedient thralls. They consume their victims' very personality by extracting and devouring their brains while they were still alive.