Rean actually didn't know what to do with her. Sure, she caused a lot of problems, killed many, all that. But it is a fact that she was also the reason Soul Gem managed to get to Lisan Universe. Ultimately, they prevented the Werdlem Empire from taking control over absolutely everything.
If we really go deep into it, had she not come, Rean would never have received the system and would have had just a normal life back on Earth until he died of old age. Or maybe Romario would have frozen him in those capsules like he did to Rean's mother from Earth. Who knows?
"Soul Gem, you brought her here, and you know her better than I do. It is up to you to decide what should be done," Rean decided to leave it up to Soul Gem.
Soul Gem shrugged. "I don't even need to see or hear it to know that Roan is probably calling you naive right now from the Dimensional Realm. That you should have just killed her and that's it."
Rean bitterly smiled. Yes, Roan did exactly that just a second ago.
