If I do the Emelan/Tortall crossover I'm pondering, it just occurs to me that the Dominion Jewel itself poses two huge problems, namely:
1. What happens when an ambient stone mage who can canonically talk to rocks like they're sapient beings gets near the Jewel?
2. What happens when the living heart of a mountain, who can talk to more rocks, gets near it?
...If I were writing epic crackfic, I'd totally ship Luvo/Dominion Jewel, actually. XD