Technically it is possible. If there is a darkness version of something like Eden Prime then the Oracle of Darkness could get control of it. Given that Darkness is a creation attribute then it could generate the elemental aether needed to restore the desolate empty lands. If the Ascians somehow managed to get a hold of the Oracle of Light and control Eden by extension then if needed to prevent the elements from going out of control before preparations were done then they could use Eden to stabilize the individual elements. This would result in life coming back to the 13th shard and returning it from a void state.

After that it would be pushing it in a more controlled manner then last time to a darkness aspect and then do a rejoining. This is the kind of plan someone like Elidibus is liable to use as his Emissary role puts him in a better position to go over the first part of the plan to restore the shard.