The Kaiser Behemoth (カイザーベヒーモス, Kaizābehīmosu?) is a recurring creature in the Final Fantasy series, first appearing in Final Fantasy XI. It is a stronger member of the behemoth family that exclusively appears as a boss or mark.
Appearances[]
Final Fantasy XI[]

The Kaiser Behemoth appears as a notorious monster behemoth that first appears in Apollyon. It can also appear assisting Dark Kindred forces during campaign battles.
Final Fantasy XIII[]

The Kaiser Behemoth appears in the Archylte Steppe as the mark of Cie'th Stone Mission 9.
Final Fantasy XIV[]
The Kaiser Behemoth is an S-rank elite mark appearing in the Coerthas Western Highlands. It is be spawned by crossing over its spawn point with the Behemoth Heir minion summoned.
Final Fantasy XV[]

The Kaiser Behemoth is an optional boss the player can engage in Episode Prompto. Defeating it yields the achievement/trophy An Emperor Deposed and an Archive Highlight. It is Lv.99 but the rest of its stats cannot be observed.
Dissidia Final Fantasy Opera Omnia[]

The Kaiser Behemoth from Final Fantasy XIII appears as a recurring boss.
Final Fantasy Brave Exvius[]

The Kaiser Behemoth appears as a recurring boss in the Nameless Ruins and Magic Library. In addition, the character Behemoth K appears as one of Hess' Eight Sages, being an intelligent Behemoth with the "K" in its name believed in-universe to stand for Kaiser or King.
Etymology[]
Kaiser is the German title meaning "Emperor", derived ultimately from the name of Julius Caesar. Many languages use a descendant of the word Caesar to mean "emperor", such as Russian царь (tsar) and Greek Καῖσαρ (Kaîsar). Behemoth is a beast mentioned in Job 40:15–24. In addition to mythological creatures, it is likened to dinosaurs, especially sauropods, as well as elephants, hippos, rhinos, and bison. Metaphorically, the term behemoth denotes "an extremely large or powerful entity".