Lucidstuck II

Derrick: explain the situation. Uilos helped you and your friends. You understand her mistrust, but Uilos was not himself when it happened. It doesn't make it right but he had done a lot of repentance and keeps working hard to prove that he's changed. All you aks is for a chance.

Seconding. Explaining that Uilos was a vessel for some darker thing that is gone now and won't be returning thanks to a friend of Derrick's, while also remaining sympathetic to her hardships should let her allow Uilos to pass with extreme reluctance. Even if she demands to keep an eye on him, it's fine.

If she was STILL scared of him she would never have approached to tell him to leave, because then he could just trounce her. He's within murder range of her right now. This seems to be pure bitterness more than fear for her life.

Seconding. But Uilos is, in fact, a boss and he has more than enough power to anihilate anything in its path, so if diplomacy doesn't work you should remind Icy of the boss monster status the leafy boy has, even if his capabilities don't work as well in the blizzard.