Hm. I've got a few questions. 1) Perhaps spoiler-heavy one, but if we choose golden guard, what would chapter 14 be about? 2) So Kersidar is still alive. How does that work? Like in warcraft, to kill a demon you have to kill him both in our dimension and the twisting nether. 3) This is not quite related to the topic, but why are demons invading human world at all? Do they run from someone/something?
1) Most likely they will launch an attack on the Empire
2) High-ranking demons are very hard to kill. Demons in Arkain don't need to be killed in the Void to die for good. Check what @Championfighter25 posted above
3)Most likely for either of three reasons: love of killing and conquest, because the Void is basically on ruins, so they need better lands or what @Championfighter25 said below