Endbringers

There are three beings called The Endbringers:Leviathan, Simurgh and Behemoth.

According to Tattletale’s power, they were never human. Rather, they are monsters (in every sense of the word) who take turns attacking locations around the globe, aiming to cause as much damage as possible. Apparently unkillables, they retreat to their respective domains when they have sustained sufficient damage and heal, only to attack again months later.

Their arrival is almost always followed by devastation, including dead capes, massive civilian losses (sometimes ranging into the millions), catastrophic damage to cities and/or large scale damage to landscapes.

Leviathan

Leviathan is the only Endbringer described in detail thus far (during the Arc8.Extermination), a thirty-foot tall monstrosity with enhanced speed, enhanced strength, a watery afterimage that follows after his every movement and macrohydrokinesis. Killed forty six parahumans during his attack on Brockton Bay, leaving many others wounded or crippled. He is apparently seen by most as the weakest of the three.