[Spoilers C4E31] Chapter 2: Hopefully Schemers make this their priority
Brennan established that after the Shapers died Celestials became feral and were hunted down and killed because they were dangerous enough to destroy whole villages. Given that, I'm surprised none of the characters are treating the captured Celestial as urgent.
All of the characters have had many moments at the table together by this point but have not yet discussed any plans to do anything about this. Plans of either killing the celestial, making other houses or the revolutionary council aware of it. I understand mechanically all the characters are too low in level to face the celestial but there are strong NPCs that could be strong enough to take it on. The Halovars were strong enough to capture and keep him restrained, I assume the head of the other houses are on a similar character level as Yanessa.
Wicander is now in a position to somehow obtain evidence of it. Azune could give this intel to the Einfassens. This is huge and could turn houses against the Creed, even as a religion because it would be found that it's false, could even start a war with them which would weaken the houses. The Creed are not in a position yet to have any control over even Dol-Makja, so the Schemers could turn all the citizens against them if they could get this information out somehow even as rumors to start with. Even obtaining information on all of the Luxs being warlocks is good information to spread around.