Ooh, there could be a fun secret task somewhere in there. "Make Tango use the Dungeon Master voice" and more.

I too am surprised I haven't seen fic with both the Watchers and the Dungeon! And apparently there are gods of the Vaults, those too could play into that, especially since Etho, Impulse, and most likely Bdubs are currently in both series, and Ren used to be in the Life series but is currently only in VH.