The server user builds up the client's house.
An exile's station will appear at the server user's location. That exile will talk to the client.
For example, WV found the cork station at Rose's place and talked to John.
The station will resemble the cruxite item.
John had a blue Sassacre book, and found an aged brown copy in a safe. The brown book had an inscription from his Nanna, which we saw at the start of Act 3. At the end of act 3, Nannasprite inscribed the blue book and sent it to LOWAS. Grandpa Harley retrieved it and took it to the Veil. The blue book went back in time on a meteor and eventually became the brown book.
Rose and Dave dream on Derse and hear the gods. Aradia hears the voices of her dead ancestors. Terezi dreams on Prospit and hears her incubating lusus. Sollux hears screams of the imminently deceased and has psychic visions.
GG > TG > TT > EB
Red team: AT > TC > GC > CG
Blue team: AC > AA > [AG or CT].
TA will presumably be on the blue team.