And there is a daily wordlquest there to help with the clean up of Dal. In 10 years it will be finished and we can start the rebuilding world quest. So by 2045 we should have dal rebuilt.
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We kill 3 during zone finale questing, 1 in a dungeon, and 1 as the final boss of the first raid. We can now harm him, but what we didn't know is that he split his power into 5 as well to make himself invisible. We have to go to Elune the Motherdragon on the moon in 10.2 to save her and have her help us defeat him. Hes too strong any other way. Its framed as the aspects are weak. The world is tired and weak after years of fighting. We lost most powerful weapons and artifacts during Legion. Azeroth herself is still too weak to help us. We go to Ysera for advice and we get her blessing to contact Elune on the moon. Cool double gravity with lots of underground moon megazone.
We save Elune and she returns to Azeroth to re-empower the Aspects, and uses the last of her strength to help us finish Chromattus. She either dies, or is returned to the moon to rest.