My note: I know it's very OP, but I'm just giving ideas, in the end it all depends on you, but the end.
By this point you should have realized that the hand cannon is a weapon designed to deal with (kill) the asuras or rather the desire or desperation to have more power.
Effects on the characters in the world of TBATE.
Myre Indrath: she could be shocked by the damage of the wounds of the surviving dragon and more with the corpse of another, dragons, since the wounds they showed were very unusual, in addition to what type of art or weapon.
kezess indrath: I think she would start to see Toren as a real threat and more for the fact that he is showing qualities of handling the aether that are not seen.
Mordain: well here I don't know if Mordain would be more indecisive, since Toren developed something that is capable of giving true death in itself, something that can destroy the soul.
Rinia: Rinia seeing the future seeing Toren how beautiful (in itself she saw Toren even more or seeing an Angel).
Last: you know me, imagine a scene, Don Arthur asks Mordain about Toren, asking him if he knows what world Toren comes from.
At the beginning Mordain would be silent thinking whether to tell him or not, but in the end Mordain would reveal that he does not know what world Toren comes from, but he speculates that Toren comes from a cardinal world or origin world.
That it is a world where other worlds are created, in itself the inhabitants of the cardinal worlds are beings capable of unconsciously creating worlds.
In short, divine beings
Explaining that Toren is one, and that is why Toren is capable of growing very fast, since his soul comes from that world.
And that is why he is loved and hated by the world, because it is an unpredictable variant that can cause good or bad events.