Avan
I think something that would help Emery learn Sword Aura would be awesome. He's already something of a genius having made the Divine Dao Sword Technique, plus being able to conjure Dao Matter, merging matter and Dark Matter wouldn't be an easy feat. Though I look forward to after he DOES learn Sword Aura to develop Dao Infusion or Dao Edge. (Something I theorize would only be possible after Sword Aura.) Learning how to stabilize or destabilize space would be cool, maybe also Learning to control Gravity to some extent. (I mean, the Maniac already uses Gravity magic & who knows it could be the way Emery would beat the Time magic user. Since Gravity bends space & Time Dilation due to approaching light speed when approaching a black hole.)
For the reward I think they could have several: - A technique or a spell of divine rank.✅🪄 - Offer them a certain number of facilities which are only valid for certain people who have achieved great exploits🏅🎖🏆🎫 - Access to certain number of resources which are controlled like celestial essence🔐 -The possibility for their faction to govern a world abandoned because of a calamity but with resources.🌏