Illithid
In the Dungeons & Dragons fantasy role-playing game, illithids are monstrous humanoid aberrations with psionic powers. In a typical Dungeons & Dragons campaign setting, they live in the moist caverns and cities of the enormous Underdark. Wikipedia
Lifespan: around 125 years
Alignment: Almost always Lawful Evil
First appearance: "The Strategic Review #1 (Spring 1975)"; Eldritch Wizardry (1976);
Last appearance: Phandelver and Below: The Shattered Obelisk (2023)