So what's my hypothesis? Maybe the Lodestone is a piece of the Home Star. The High Ones took a piece of their dying planet into the Palace with them. The trolls, when fleeing to the underground, grabbed it and took it with them (or perhaps they took it during a raid of the Palace before leaving for the caverns under the Father Tree Holt). The simple discision that Cutter made to chip off a piece of the Lodestone for Skywise so long ago, may play a bigger part now at the end.This gave me chills. I'd almost forgotten about the Lodestone as anything more than a Signature Skywise Accessory, like Jughead's hat. Brava!