I seldom comment on this series despite liking it very much because it's all bullshit anyway, so any attempt at a thoughtful comment will be by definition overthinking. There's no there there, so to speak.
But sometimes I just can't help myself, and this is one of them.
The way I see things, this is gonna end with Roars and the Sun Cult teaming up against the Bloodline of Scales. In the process, the Sun Saint will get replaced by Crimson or more likely Ragna.
The reason for that is simple: Sigmalio has set things up in chapter 78.1 so that the war between Roars and the Cult advances the world magic "regardless of the outcome". Meaning, so far he has actually outwitted Crimson: whereas the latter is probably contented that his/her strategy will lead them to victory against another bloodline, the former has ensured that any such victory is Pyrrhic.
So the only way to thwart Sigmalio's scheme is by stopping the war. And I think the key to it is gonna be Chimaera: because Ragna sent her to find Majorca and her mages, she's gonna infiltrate Gehenna. My guess is that she's gonna find them, at a point where the war will have tipped towards the Cult, and then Majorca will tell her their victory plays into Sigmalio's hands. Chimaera will proceed to relay the info to Crimson, who'll change his plans and move to stop the war.
Of course, it's also possible that the war will be prosecuted to completion, and this will bring world magic (whatever that is) to the verge of completion, making the last stretch of the series a race against time.
