I quickly reviewed the history of Erathia. Belqet is essentially the father of the Necromancer faction. Erathia is a passive state (with the exception of the Markel incident and the War of the Broken Staff); it's unlikely that the Necromancers will all unite and decide to start a war. They need a determined leader like Arantir to do that.
As for the plot, we should first decide on the ending of the Dark Messiah storyline so that everything is clear afterward.
I didn't quite understand what the Order of Void is. What is this order, in general? And will there be otherworldly interference from the Void in the RTF storyline, in the form of dark angels with an army of the Void, or will the Alt-Greid simply be the troops of the order?
Added 30 seconds ago
Excellent, so everything is much simpler now.
The Order of Void was created by the Necromancer Sandro. He created a theory according to which Ashen is a prison for souls and was created to maintain the cycle of life and death, which sustains the dragon gods. He believes that if a god is killed, the boundary between worlds will weaken, and it will be possible to travel freely in the multiverse.
Added 1 minute ago
The Order is Sandro's followers, and the first follower was Lucretia