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God Killer

The term God Killer is used on a human, demigod, demom, or a god killing a member or more of a pantheon of gods which is considered illegal as they would be deemed as dangerous.

Cinos have help defeated Dagon during the war between the Forever Knights and the Esoterica as Dagon want to claimed the world like what he did to other dimensions, he was stop when Vilgax absorbed his powers into himself but he was defeated by
thank to the Sword of Escalon. 2 years later, Dagon reform into his original body as he lost his Esoteric powers but don't care about it as he want revenge on the Forever Knights who survived and led by a new Forever King (Forever Knight from Ben 10 Reboot) and he created his Esoterica as he dont want to used his natural God powers to fight Cintas he decided to steal powers from Vilgax as payback and ready for a rematch. Even with power he stole from Vilgax, he was defeated and killed by Cinos, unknown to the Werehog that he have committed an Earthly crime, he may die but he hope that he will face the consequences as he know that his son (technically son-in-law), his heir, the King and Ruler of the Cananite Pantheon, Beelzebub, the Prince of Hell and Sin of Gluttony will take care of him.

The first ever God Killer in existence was the Dharmic God of Wrath who have killed his pantheon which are Deus, Olga, Wyzen, Augus, Sergei, Kalrow, and even their creator god Chakravartin. Zeus was an old friend of Deus as he notice this and alert Oberon and other gods for what Asura have done to his fellow pantheon as they punish for killing them, meanwhile Poseidon took Mithra as prisoner so she can't defend him. Zeus gave Asura the Eleusine Stone to give as he claimed owner of this fallen god as he and Mithra are not under the ownership of the Greeks as Zeus avenge his fallen thunder friend.

The most infamous God Killer in history is Kratos, the demigod bastard son of Zeus who was raised by along with King Leonidas who he see like a father figure and older brother of Deimos. Kratos was Ares chosen warrior due to him being jealous of Athena and Odysseus, he gave him a God Fruit which is a deep mistaje, he unfortunately brought his wife Lysamdr and daughter Calliope to his location to congrat him for glory, Ares made another  horrible mistake as Kratos accidentally killed his family as he now want revenge of Ares, he later found his mother who turn into a monster and told him that his brother is alive and Zeus is his father, now he want all the gods to die. Kratos have killed Erebus who is Nyx's husband and their Thanatos (who later revived by his Hecate but he wasn't the sam), ripped Helio's head off his body, defeated Hercules, Theseus, and Perseus (who require magic to restore him thank to Medea as they changed his face), traumatized Charon, forced Atlas to hold the world as he broke the pillars, and collect many of their weapons and artifacts.  He was defeated by Zeus, Poseidon, and Hades as they combined their weapons the Master Bolt, Trident, and Bident to create the Spear of Trium, they collect the Epirus Bow, and Zeus used his Blade of Olympus to stop him which they finally did and send him to Tartarus, as he is a major example of a God Killer. Due do this event, Zeus don't want another incident every again which is the reason why he become an enemy of Cinos as he views Cinos as a threat

Other who could have been God Killers

Will Turner killed Davy Jones in the heart as he is God but Will died as he becomes the Captain of the Flying Dutchman which is already his punishment.

Goliath used the Eye of Odin to power him up as he fought Odin himself, he could have been a God Killer but he come back to his senses.

Sir George fought Dagon as he took his heart out, he defeated the God but not killed him as his heart is still active as his source of power. Vilgax also kinda there took as he absorb Dagon.

Moana fought Te Ka who is really Te Fiti, she restore her but if she and Maui have other chances as a last resort, they will be put on that label.

Sigrid have a deep hatred for Thor due to him killing her Jotun family as she desire revenge as she was given a weapon to kill him, which she came close but was killed by Loki as he used his devil-like form named Utgard.