User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-32252462-20180424075650/@comment-30048084-20180424130206

The Devils created by Hades are not allies of the underworld, In volume 24 it is mentioned how unknown Devils are attacking multiple factions/mythologies. They also mention the fact that they are pureblood devils but the underworld has no previous knowledge of their existence. The question of whether some of them will defect to the underworld is unknown.

I doubt Hades opinion of devils and fallen angels has changed, he is merely using Lilith.

If the alliance becomes aware of Lilith's existence they would save her to prevent her being used to create more devils, What will happen afterwards is also unknown but I am guessing the Great King Faction would want to use her to maybe resurrect the extinct pillars or merely make more pureblood devils to maintain the bloodlines of the remaining pillars.The Maou faction will on the other hand come to an agreement with the other factions where Lilith(returned to her human form) can remain safe and her ability cannot be exploited, this option will allow the balance of power to remain intact.