Concept Art 49: Archon Sabaoth pt2 (Patreon)

Now this is what I'm talking about, look at this big baddie.
This is the final design for Kaius's Archon form or Sabaoth if you wanna call it that. The first time we see this form, Kaius loses all control over his body to the Archon. Sabaoth goes on a rampage due to plot reasons (mostly Sabaoth discovering he has been replaced by Kalila's Sabaoth and he was abandoned by father, Adam ), and is up to Asher and the party to stop the demon and try to rescue what is left of Kaius. Suffice it to say that after the battle we have some emotional scenes between Asher and Kaius, and you could say they officially become a couple after this situation is finally solved.

As extra info, Asher is unable to defeat Sabaoth and decides to offer a deal:  if Sabaoth gives Kaius back, Asher will find a body for Sabaoth so he can exist by himself, if the boy fails to fulfill his part of the deal then he will surrender his body to the Archon. Sabaoth might suspect who Asher is by now and grows a fixation on him, curious as to what what the boy's journey would take them, Sabaoth accepts the deal and becomes a more constant presence in the party. After all, even if Asher fails, is a win-win situation for Sabaoth.