Defeating Deadly Dagannoths is an achievement that requires the player to kill three dagannoths in the first layer of the Waterbirth Island Dungeon.

Talk to Jarvald on the westernmost dock in Rellekka to reach the island. The dagannoths are weak to earth spells.


  • This achievement used to be a task prior to the release of the Achievements System on 18 April 2017.
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