Ragnarork

According to Orc myth, this will come about when Warlord Ragna da Destroyer, Gork's (or possibly Mork's) chosen leader of the Last Waaagh!, goes mad with an axe and destroys the whole world. This is the famous Orcish day of Ragnarork, and forms the basis of one of Orcdom's most popular and enduring campfire tales.

Source

 * : Warhammer Armies: Orcs and Goblins (8th Edition)
 * : pg. 74

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