Oh he'll largely be coming by the cult accidentally, probably within the next few months. He has a bad habit of showing up, dealing with whatever supernatural threat is trying to kill somebody in the Falls, then just [literally] disappearing afterward if the person doesn't need any serious medical attention. So it's going to result in some of the people he's saved just sort of making up their own reasons for it and who exactly he is, then running with it until he catches wind of what's going on. Then he'd end up taking it over because he'd be more than a little worried that whoever's making shit up might decide to use the cult for their own ends, and he'd rather it be put to good use.

He dresses like some creepy death cultist from beyond the stars and can literally disappear and reappear whenever he feels like it. He's got enough self-awareness to know that nobody's ever going to assume he's some kind of benevolent entity, so leaving anyone alone to make up their own stories is asking for trouble.

Anyway, he'll be spending a whole lot of time in Atlantis for this confluence, so he could always run into her there! Or whenever you have her exploring the wider world, since he doesn't have access to guild headquarters, and prefers to give both guilds quite a bit of space so he can stay off their radar.