Ancient Xi
So his main goal is eight small worlds, so he needs two more. Since one is going to be related to the Heavenly Tribulation, what's going to be the core of his final, eighth world? Considering his experiences with the Chaos Dragon, the black void of the Divine Eye, and his burgeoning sorcerer constitution, I think it should be related to the primordial chaos or the void/nothingness at the beginning of the universe. As a tally, he currently has the following worlds... ASTRAL, ILLUSION, PATH SOURCE, DEITY, DIVINITY, and SOUL.