Fair enough

@Kirbyfreak: Much like how various shops and story NPCs become available as missions are completed by anyone on a server, that'd be useful information... for a multiplayer server.

For a singleplayer server, it'd only come into play if the player didn't bother to wipe out their universe (which would probably be likely for frequent modders like me, and perhaps you as well).

Overall, methinks my mod here would be more valuable for singleplayer modders who must wipe their universes frequently to try out new mods (especially of the universe-generation kind, especially Frackin' Universe, but also mods like TrueSpace, RealSpace, or IT'S FULL OF STARS).

...For the record, as far as I'm aware it's Ursa Miner logic:

It remains open from the moment the objective is completed forever.
Once one character beats the ruin the vaults are open forever iirc