Timequake

Timequake was a crisis that occurred after the Time-Twisters replaced the Time-Keepers, and used the Keepers' servant Immortus to destroy known nexus beings in several divergent timelines, hoping to assure their own existence. One of their targets was the Earth-616 Scarlet Witch, and although Immortus failed, the Twisters managed to transform him into a frozen repository of temporal energy. However, their attempts to manipulate the last, most crucial timelines were thwarted by the mysterious Whisperer, who turned out to be a projection of Immortus.

As each nexus being survived (save one, the Ultra-Vision), the Twisters' probability of existence decreased, until they ceased to be altogether. As a result, Immortus broke free, and became a temporal wave, able to rewrite existence at will. He was stopped thanks to the Time Variance Authority and the Watcher, restoring the Time-Twisters (still disguised as the Time-Keepers). However, their masquerade was revealed by the real Time-Keepers, who reverted their counterparts back to an embryonic stage and returned them to the Citadel at the End of Time.