Arishem first came to Earth-616 along with several other Celestials in order to begin the creation of the Seventh Cosmos, coming into conflict with the primordial god of darkness Knull, who ruled over the Void that had been formed by the destruction of the Sixth Cosmos. When Knull killed one of Arishem's comrades, the Celestials retaliated by banishing Knull back into the void, though he eventually returned to wage war on them.
Arishem is the leader of all the Four Celestial Hosts on Earth, as well as Fourth Host on the planet called Pangoria and a Fifth Host on an unnamed planet in a distant galaxy. Arishem was responsible for the culling of the Deviant Race during the Second Host visit to Earth and caused the Great Cataclysm that flooded the world. He is also the leader among the delegation of Celestials who waged war on the Watchers in an unknown galaxy. He was one of two Celestials who had the right and ability to judge which planet's civilization would live and which would die. X-Factor has encountered him during Judgement War. Cyclops managed to blow off Arishem's hand with the help of Jean Grey and the Phoenix Force, preventing him from casting judgment. Cyclops, along with the X-Men, briefly encounters him again, and tells him and the rest of the Celestials to leave.
Arishem, along with almost every other Celestial, was killed when the Beyonders attacked the Multiverse. He was later resurrected when the Queen of Nevers used the last surviving Celestial to restore the Celestial race.
Before the Final Host of rabid Dark Celestials invaded the Earth to purge the planet, they attacked and killed all existing Celestials, including Arishem, by infecting them with the Horde. Arishem's body was hurled to the Earth to herald the Dark Celestial's arrival, and it landed in London. During the Avengers' final stand against the Dark Celestials, the Horde reanimated the bodies of the fallen Celestials. In order to defeat the Horde, the Avengers merged their energies to form a Uni-Mind, rendering the Horde dormant with its power. The Celestials returned to life, and assisted the Avengers in taking down the Dark Celestials.
Cosmic energy control with an unknown upper limit. Arishem endured the combined assault of Odin, Zeus, and Vishnu without suffering any damage, and his energy is described as "immeasurably more potent" than that of the three Skyfathers. He is capable of permanently destroying dimensional bridges. He also melted the Odinsword and exorcised its curse.
- Arishem should not be confused with the somewhat similar-looking Red "Gardener" Celestial who was slain by the Apocalypse Twins.
- Arishem is the most powerful of the Celestial Hosts, except for Dreaming Celestial who already defeated him during Second Host. Also, the power and size of Fourth Host are as nothing compared to other, higher level Celestials such as Exitar.
- 60 appearance(s) of Arishem (Earth-616)
- 14 minor appearance(s) of Arishem (Earth-616)
- 3 mention(s) of Arishem (Earth-616)
- 29 image(s) of Arishem (Earth-616)