Looks can kill, and this massive blood-red eye can't help but look at everything.
Description, Final Fantasy All the Bravest.
The Blood Eye (ブラッディレッド, Buraddireddo?, lit. Bloody Red), also known as the Red Eye or Bloody Eye, is a recurring creature in the Final Fantasy series, first appearing in Final Fantasy IV. It is a typically a type of ahriman.
Appearances[]
Final Fantasy IV[]

The Bloody, also known as the Red Eye or Blood Eye, appears as an enemy encountered in the Passage of the E dolons. It attacks in pairs or trios, and fights using Drain, Death, and Bloodfeast, but is otherwise not a difficult foe to defeat.
Final Fantasy IV: The After Years[]
The Blood Eye returns as an enemy encountered in the overworld during the Lunarian's Tale as well as in the Challenge Dungeons for Kain, Edge, and the Lunarians, while one is fought as a boss during Porom's Tale at Mysidia. It is a moderately powerful foe, fighting as it did before.
Pictlogica Final Fantasy[]

The Blood Eye from Final Fantasy IV appears as an enemy.
Final Fantasy All the Bravest[]

The Blood Eye from Final Fantasy IV appears as an enemy.
Final Fantasy Record Keeper[]

The Blood Eye from Final Fantasy IV appears as an enemy.
Final Fantasy Brave Exvius[]

The Bloody Eye appears as an enemy encountered in the Lechios Hills, Dalnakya Cavern, Magic Library, Golzas Canyon, Dwarves' Forge, Volcanic Grounds, Surging Volcano, Squirming Burrow, Misma Pass, and Colosseum. It also appears during the events "Demons Unleashed," "A Promise Beyond Time," "Time for Revenge," "Return to the Halloween Castle," "Fate of the Dragoon," and "The White Sage and the Magic Cane."
World of Final Fantasy[]

The Blood Eye appears as a Mirage encountered as an enemy in the Dragon Scars and Valley Seven; it can also appear in the Coliseum, EX Dungeon B, EX Dungeon C, and EX Dungeon Z. It can be imprismed using a Blood Eye Prism if it is the last enemy standing, and can be transfigured with the Buer and Floating Eye.