Since Nation Wars effectively killed nirvana, I'd like to make a suggestion to bring nirvana back to relevance.
1. Replace current uncanny/rapture drops with supply tokens. This can be done in the form of a quest reward once all bosses are done (like current fsp) or with an npc after each boss (like old fsp).
2. remove the cap on number of entries per day.
3. remove the requirement of having a full squad to open.
Giving supply tokens, instead of items themselves, as a reward should keep the market of all items made from supply tokens stable, since all items made with supply tokens still have the forge fees applied.
Removing restrictions on the instance gives players a way to farm supply tokens in a PvE way on a consistent basis, in the way TT was once used.