Yeah, the idea definitely needs development to prevent exploitation. I think that if levels weren't matched, or if total levels exceeded the player you fought by 3-5, there shouldn't be any gains. Preventing team abuse would be a whole separate issue, I'm not sure how to weigh the effort someone puts into a fight, especially since switches/moves could be coordinated through discord or the like. What if the gains were small if your whole party survived, and scaled up as your team was defeated? Just throwing numbers, but maybe 200BP-2500BP overall range, just so it's a bonus and not some crazy incentive. A cap would definitely help. That coupled with the inherent race to duel the owner would be a start towards preventing abuse.