So it’s possible to conquer a dungeon and claim its heart crystal. Or you could claim it’s IoP and destroy the dungeon. If those two don’t fit your desires you could possibly drain a dungeons magic and reduce its levels. That sounds a lot like a PoPs heart crystal. I am hopeful Ricther comes up with a fourth plan. When he claims the heart crystal of the HoEHs and gets told he can’t be the master of two dungeons. Then he should make his dungeon consume the Hall of Elemental Hunters. Ricther being a master and having a keeper they should be capable of using a dungeons heart crystal to feed his own dungeon. If he can’t claim another dungeon. Or as a possession he could will it to a loyally sworn vassal with the condition that upon their death the crystal comes back to him.