Nodeo-Franvier

Duma blessings on Rigel aren't quite as overt as Mila's upon Zofia but I think the game does provided us with hints. The weapons and equipment from Rigel are much superior to Zofia for example(Rigel gotDraco shield,Royal Sword etc...,While the best stuff from Zofia are Riderbane,Blessed lance) It's probably because Duma give them material for forging(Maybe he strap them on necrodragons) Aside from that he also provided long term stability(Unlike great nations from before Awakening that split apart)

My head canon is that degeneration is linked to the body of the Dragon(hence why Mila and Duma are lucid after death/on the verge of death) and Loptous escape degeneration by becoming a book Perhaps if Duma was restored by Celica soul he could become Duma spear and take over Alm body,It's even easier for Mila since she's already a skull.

Shadow of Valentia introduced a pretty interesting plot point that is curing of Dragon degeneration,Throughout the game Jedah the high priest of Dumah faithful tried(and briefly succeed) in either capturing Celica to sacrifice her brand bearer soul to Dumah(purportedly to cure him,But there some lines of dialogue that muddled his true motivation) Jedah: Cease your lamentations and come along, girl. I’ll send the boy to you shortly. That I can promise. Celica: No! Not Alm! You swore to leave him alone! Jedah: Keh heh heh… How hopeless a fool can you be? Rejoice, Lord Duma! I have brought the Brand-bearer who threatens your order. Take her soul unto you and feast! Ultimately I still think Jedah true intention is curing Duma and securing the future of Rigel and Valencia however. Aside from that the part about offering brand bearer to cure Duma degeneration doesn't seem that unsound considering how Loptous an inferior earth dragon can circumvent degeneration entirely using blood pact,It's hardly a strecht to think that Duma(and Mila) who's possibly the second strongest divine Dragon could employ a similar method. A healed Duma(and maybe Mila) would do wonders for Valentia/Valm too considering the fact that Grima would popped out later(The combined power of Duma and Mila was able to check Naga AND her army for nine days straight) Anyway that my take on the whole thing. PS.It's a bit of a shame that we don't have Celiac sacrifice route in echoes