The Mindflayer is an enemy in Final Fantasy IV: The After Years. They are mildly challenging, being able to hit decently hard with physical attacks as well as inflicting Paralyze and Sap with their Mind Blast. It is advised to defeat them first, though any method will work well against them just about. They will follow a strict pattern of Mind Blast > Drain.
Mindflayers, or "Illithids," are a race found in Dungeons & Dragons. They appear humanoid, with heads that resemble octopuses, and frequently are found in the Underdark. They have fearsome psychic powers, subsist on a diet comprised of the brain tissue of sapient beings, and often enslave other races.