Endbringers

There are three beings collectively known as 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.

He is widely viewed as the weakest of the three, and is known as the 'middle child' as he was the second to appear. The name Leviathan comes from a biblical sea monster, and is also the name of a prince of hell in Demonologist texts. Other nations refer to him by other names, including Jörmungandr.

Brockton Bay Attack

Leviathan killed forty six parahumans during his attack on Brockton Bay, leaving many others wounded or crippled.

List of known dead during the attack:Dauntless, Velocity, Aegis, Gallant, Manpower, Shielder, eight of Bitch dogs, Kaiser, Fenja,

List of known crippled during the attack: Armsmaster, Flashbang,

Other Attacks

Leviathan is known for the attack on Newfoundland, where he killed nearly half a million people and wiped the Canadian province from the face of the planet

His most devastating attack to date was at Kyushu, Japan, where the heroes failed to stop him and he killed nine and a half million people.

Behemoth

Taylor hints at Behemoth's powers when she states that Scion would only really have trouble with Behemoth if he arrived too late, and Behemoth had turned the landscape into a radioactive, magma-ridden wasteland. Legend notes that Behemoth is physically the strongest of the three.

Behemoth is also known as Hadhayosh, as well as other names. Both Behemoth and Hadhayosh were vaguely described in religious texts (the book of Job and Zoroastrian texts from the middle-Persian era, respectively) as beasts that could be compared to massive elephants or oxen. Hadhayosh specifically was large enough to house entire nations of men on their backs. One could surmise that Behemoth is big.

Simurgh

The first Endbringer mentioned by name, the Simurgh is named for the massive mammal-bird that rests on the tree of life. She is also known as Ziz, which is a griffin-like creature with a wingspan that can block out the sun, who is otherwise very similar to the Simurgh in nature and description. Interestingly, the creatures for which she is named are actually benevolent. The Simurgh as she appears in the setting is most definitely not.

Much like Behemoth, the Simurgh has yet to be detailed in depth, so readers must draw the clues about her nature and powers from various places in the text. In the Agitation arc, Tattletale notes that the Simurgh is the only conventional telepath in the setting, and that this scares people. In 8.2, Legend calls the Simurgh a cunning manipulator. In chapter 8.4, Taylor states that the Simurgh is noteworthy because winning the fight against her isn't necessarily a problem, that the heroes could "Win every battle against her, lose the war."

The Simurgh is the only one of the Endbringers that is described using female pronouns.