The Thanatos (タナトス, Tanatosu?) is a recurring creature in the Final Fantasy series, first appearing in Final Fantasy III. It typically takes the appearance of a headless knight.
Appearances[]
Final Fantasy III[]
The Thanatos appears as an enemy encountered in the Ancients' Maze. It is a moderately dangerous foe, as its physical attacks can inflict a decent chunk of damage to a character, and in the 3D remakes it can attack twice in one turn. In addition, it can also attack with the Breakga spell to inflict Petrify.
Final Fantasy XIV[]
The Thanatos appears as a boss encountered in 
The Labyrinth of the Ancients, referencing its Final Fantasy III incarnation.
King's Knight -Wrath of the Dark Dragon-[]
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Final Fantasy XVI[]
The Thanatos appears as an A-rank notorious mark encountered in the Titan's Wake region of Dhalmekia. The hunt is unlocked after completing the main scenario quest "Brotherhood."
Final Fantasy Mystic Quest[]
The Thanatos appears as an enemy encountered in Pazuzu's Tower and Doom Castle. It a dangerous foe as it has access to a wide array of abilities, including Cure to restore its HP and the Instant Death ability Doom Dance.
Pictlogica Final Fantasy[]
The Thanatos from Final Fantasy III appears as an enemy.
Final Fantasy All the Bravest[]
The Thanatos from Final Fantasy III appears as an enemy.
Final Fantasy Record Keeper[]
The Thanatos from Final Fantasy III appears as an enemy.
Mobius Final Fantasy[]
The Thanatos appears as a water-elemental Support ability card, granting the Debrave ability.
Etymology[]
Thanatos, or Thanatus, is the dæmon personification of Death in Greek mythology.