So I came up with an arc that could possibly work if Existence was recreated, but it's probably not very good:
With the recreation of Existence came the recreation of a primordial breach, out from which a stream of Prime Daemons is released. These demons can temporarily copy or disable the powers of a being they're around, and in some cases they'll even take control of the being (temporarily). The group has to figure out how to close the breach and defeat the demons.
lel it's probably terribad