Hello! Here is an update from the mods in regards to this situation:

"[Luke and Asch] would have to learn how to stabilize themselves through some kind of magic, dunamis or technology, which could then be assisted with the energy from a complete crystal(s) and their Arehtei, if the latter agreed to it.

[The Arehtei themselves] wouldn't be able to solve the issue. Piphron wouldn't know anything about how their situation works or about curing diseases, since the past instances of that have been mostly through character effort with minimal Arehtei influence, but he could suggest that he'd be able to lend them some energy for the process if he was so inclined!"

If you would like to still meet with Piphron, he will express the sentiments of the second paragraph - i.e. that he doesn't know anything about what's going on with them but he can support whatever they decide to do with his power. I'm happy to thread this out if you would like!

If you would like to plot this out more, I suggest you use the mod contact and speak with them directly! Thanks!