Blooky will be trapped inside. Apparently the mods said that they'd be able to phase out of the temple, being a ghost, but they cannot bring anyone or anything through the walls. Expect them to not realize this until around the last day or two of the plot, though, as most of their time will just be spent going "...oh" and not doing much. They can probably just check up on the people outside/give them news of inside shenanigans, if someone wants them to.

Mostly they'll be lying on the floor of their room/the heart room.