illyisabot
You might need to go with the primordial route. You've got Yaweh as a primordial in this so if you want there to be any semblance of canon, you'll either need a primordial to temporarily kill him during the holy war or you'll need him to step back and not get involved anymore after the war. Him stepping back is a pretty valid option in this au though because you already introduced the "no interference unless the pantheon is imploding" rule.
illyisabot:As of now I've got two ideas for it, the first one where Trixeha was one of the original dragon bearing the concept of destruction who tried to forcefully ascend to the ranks of a primordial but succeeded partially but lost its sanity.The second would just have it be a monster born in the dimensional gap...( I'm more inclined towards this )
I think Dragons are the living and Physical manefistation of Concepts where Gods and Primordials are Spiritual Manefitation. OPHIS is the manefistation of the Dimensional Gap itself. She is the the Dragon of infinity, Chaos and Nothingness. She is the Dragon God. Great Red is Birthed by the manefistion of DREAMS leaking from the universes Connected to the Dimensional Gap. He is Connected to the Dream of all sentient and can turn the illusion of Dream into reality. He is technically not a dragon God but a Very Powerful Dragon emperor. Thats why Ophis hates Great Red He is technically a trespasser in her pwn Domain. And She hated His Concept which was Dream. Thts why He calls him Noisy and wants to Reclaim her silence. Well IT JUST A THEORY!!