For the second version give a tag to inscriptions so that "old" inscriptions from a different vault give less loot than a boss summoned using inscriptions from the same vault. (Maybe have the old bosses less powerful aswell)
We actually thought of something like that before!
But I personally love the idea of "old" inscriptions giving less loot!
I'll let iskallman know about this :)
For the second version give a tag to inscriptions so that "old" inscriptions from a different vault give less loot than a boss summoned using inscriptions from the same vault. (Maybe have the old bosses less powerful aswell)