Kera was never trapped in the Void.
Theer was coming back on his own, using El'Arad as his puppet in doing so.
We Beat Theer, Kera shows up using the spell we helped test to steal the power from the Swords of Destiny....which yes is unstable in him.
the Gods are trying to figure out how to beat/subdue Kera...as killing him is not an option, and he right now CAN potentially kill them.
Rallos is raising the Kromzek to march on Kera....Drunder is part of him manifesting himself on Norrath, not an Avatar, but the God of War himself.
We're looking to free Vallon, Tallon, and Sullon from Drunder. Rallos plans on consuming them to counter the energy loss of manifesting directly on Norrath ( Sullon seems to be the only one aware of this)
the plan is Sullon/Tallon/Vallon face weakened Rallos, Kill him, we use the divine energy of rallos' death throes to 'rempower the Swords of Destiny.
Presumably, we'd had these off to Theer, who would use them to take the power back from Kera...then we deal with Kera himself.