- An abyssal horror awaiting within Costlemark Tower. While it may have genealogically arisen from the mindflayer, this abominable daemon can lay claim to that lineage no longer, so greatly do its powers exceed all of the breed.
- Size: 9.54 ft. Weight: 333.1 lb.
Braindrainer uses both physical and magical attacks and employs an Ice-elemental attack by blowing a cloud of chilly air in a wide arc in front of itself. It can confuse the party. Its attack where it approaches with glowing hands outstretched can be blocked and parried. It can grab Noctis and a QTE initiates where the player needs to break free, otherwise Noctis is killed. It is weak to polearms, daggers, lightning and light. The player can't use items during Costlemark's Menace Dungeon.
Electon spells are great against them, especially in the room with four braindrainers. Using top-tier daggers against braindrainers is excellent as they attack so fast, and Ignis can further boost Noctis's damage with them with Enhancement. Attacking fast with daggers also fills the Armiger meter quickly and the player can use it frequently while within the menace dungeon. A warp-strike might topple a braindrainer, making it temporarily vulnerable. Ignis's Libra Elementia also uses lightning magic on it without needing to craft a spell for it.