The Great Revision

The great revision, as described as coined by Zaros is said to be the end of the current universe.

Elder Gods
During the end of a cycle, the Elder Gods 'hatch' from their eggs inside the Elder Hall, (currently located on Gielinor) crawl to the rift inside and then proceed to suck the Anima of the world dry to revive themselves.

They then proceed to destroy every planet except the one containing the current Elder Hall. It can be deduced that the Elder Gods spend their time and energy creating worlds that can produce the maximum amount of Anima so that they can be nourished. However it is believed from Zaros' account that this is not always accomplished and that many Elder Gods died and or born stillborn from a lack of sufficient Anima thus making the Elder God & the multiverse in danger of ceasing to exist.

The end of things
The Great revision has been prophesied for some time by the Fremennik. This event is known to them as The End of Things, however it is described as a huge battle.