The ritual fails, and Nero instead gains Kali's sickness. The party returns to the Lighthouse. Rao, frustrated, disturbs the equipment in the infirmary to try and create a disease suppressant out of a vial of water and the flowers they had used previously. Corrin also heads to the school to see if the researchers there were able to recreate the effects from the flower. Rao fails, though is able to somewhat heal himself in the process. He chills a bit, and goes to speak with Millie.
Rao: How are you doing?
Millie: I'm doing alright. Better than you are, at least.
Rao: Yeah, well... thought we had a cure. Turns out it was a joke.
Millie: Don't be hard on yourself. You're trying.
Rao: What good is trying if you never succeed?
Millie: Well, you won't succeed if you don't try either. You know, you ought to look into those stories we studied together. They might have some valuable truths for you to look into.
Corirn, at the school, finds that they're able to regerminate the flower, but it grows VERY slowly outside of Luvia. The party takes stock of the books they'd foudn in the ruins, and begins to read through the ones they can understand, including one about the stones and their powers.
They decide their best course of action is to look into the strange water behaviors going on near the Isle of the Damned, likely caused by Rossto and the stones. Knowing that the Water Stone allows him to teleport, the party goes outside to practice teleporting with the Wind Stone. Rao and Corrin use Wall of Force to stop the mob outside. When they touch the wall Rao made, they contract the disease.
To figure out where Rossto is, Rao casts scry. Rossto is scrying on Caveson, who is in the room with the Light Stone and is speaking to Raine, who is tied up to a contraption of some kind. Because of the degrees of separation, we can't hear the conversation. Rossto seems to be surrounded by a sickly-green snow he is keeping pushed away from him. Kali tries to use the Wind Stone to teleport Raine out from Caveson's captivity, but fails. Caveson realizes that magic is being used, and cuts off Rossto's scrying.
The party teleports to where U.R.M.O.M. is parked on the edge of Galia, and attempt to teleport the ship to Big City using the Wind Stone. They do manage to do the teleport. Corrin then uses the Wind Stone to cast Big Gate to get to the Isle of the Damned. A strange, iridescent green snow is falling, so Nero casts control weather to make the sun disappear instead. A magical darkness descends on the party, which Rao is able to counter with "Big Light". However, as it is a Black Sun, he is unable to locate Rossto or the Water Stone. They travel to wait and see if the weather changes. As they're flying, they spot an abandoned tent. Corrin's familiar flies down and manages to grab some research notes from the old expedition camp. The notes appear to be a map of some kind, indicating where this camp is, and a spot noted by a skull and flower. Eventually, the black sun turns to acid rain. Corrin uses the Wind Stone to create a wind umbrella over the ship.
While Corrin and Rao are debating their next steps, Callow clears her throat.
Callow: Caveson has a proposition.
Corrin: What the fuck does she want now?
Callow: She says that she won't kill Raine today if we can give her Rossto. And she says he's on the Astral Islands.
Rao: We might as well take Caveosn up on the offer so she doesn't kill Raine.
Corrin: Well... when I was back in the Ruins, the Benefactor came and offered to help defeat Caveson--
Callow: She can hear everything you're saying through me!
Rao and Corrin silence and deafen Callow so they can keep discussing the plan, and step into another room. Rao reveals he has two wish scrolls to rest of the party, including Rhea. Then, Callow tells them that Caveosn has teleported Raine to Astral Island.
The party teleports the ship back to Big City and the Lighthouse. They leave the ship at the Lighthouse and go to Astral Island, appearing as Big City. Rao breaks his leg. It seems the Astral Island molds itself to whatever the group speaks, so when one of them say "comfortable", the group is smothered by a comfy bed and a weighted blanket, which freaks Rhea out. When Nero says "this isn't his second rodeo", two rodeos appear.