They put on the armor and managed to sneak into the castle. The castle was pretty shit. Turns out Reginald Harker, old man mayor from Fairbury that Kronus killed, is still alive being a dick.
In the castle we had an hour long moment of trying to figure out a puzzle that the answer was very straightforward if someone did a perception check in the garden when they first entered (somehow the only room they didn't do that). They solved the trap's puzzle and continued to the dungeon and prison cells downstairs to rescue the people there to help re-capture the castle. They gained the help of the half-elf Elneak Jan-Martin, who remembered a secret passage the guards were using in the basement, and found it.
The party continued down this hidden passage deep into the rock until they encountered some cultists, and attacked them by surprise. The fight was hilarious as two of the three cultists did suicide spells that knocked out everyone except Garoth and Ivellios, who went around and helped everyone recover. After recovering, the party continued down the path that eventually lead to the shadow cult's lair. There, they found a temple that had a chest with three magical items (an all-black longbow, a pair of gloves with wraps that defy gravity, and a pair of goggles with green lenses that gave a light glow), and a laboratory with the chopped up remains of many people, in the process of being turned into flesh golems.
After a bit of exploring this seemingly empty lair, they eventually opened the door that had Reginald Harker behind it. Elneak immediately went to shoot him, but the session ended here, about 6 hours of play time later.