A Giant Flying Brain is a disembodied human brain of immense proportions, approximately six feet in diameter. It hovers five to ten feet over the ground, flying with great speed and blasting spells imbued by its Magic-user creator. Seeing a giant flying brain is so terrible that any living creature must save vs. Spells or be paralyzed for 2d8 rounds.

This strange creature can cast mind reading at will to a range of 100 feet. It casts other spells as a 4th-level Magic-user, two first-level and two second-level spells determined at the time of creation. Giant flying brains require eight hours to regain access to spells after being cast, but they do not require a spellbook. They cast spells without the need for hand movements or speech.