The next world has been selected as Douluo Dalu there was a motherfucking genius in the comments who suggested a type of collar for the spirit ring to make animals into female harem members but now listen to me on this. What if we skip that whole fucking collar thing and just make a harem spirit!
Each ring instead of abilities unlocks a girl that will battle in the spirit world for me. It can be anyone you fucking want we need 9 Women. It can be Evangeline from negi whatever, or shaltear from overlord shit it could even be a goddess from Danmachi to use to teach skills. Or it could be one of the girls we already have in the realm.
So vote my brothers and sisters on which one you want to see. Write down who you want to add. Let's goooooo. Voting starts now in the comments!