[Suggestion] A new spy related Simaris' sanctuary mission, and or a secondary Simulacrum key/upgrade segment.

[UghZug]

We as tenno can already use Simaris to practice a lot of our skills for mastery ranks, testing loadouts, earning mastery, but there isn't really a place to practice all the spy vault tilesets at once nor rate other tenno against each other for spy mission types.  This is why I feel like an onslaught Spy edition could be added as an interesting side content for players to both practice the skills needed to complete the tilesets in a timely fashion but also be rated for their success.  Make it a bit like portal puzzles, once completed you are automatically dumped into the next vault room.   Complete a set of 3 vaults to advance to the next difficulty and maybe get a small cake in the process.  One alert and you're done, mission over.  This mission type should be a solo one to challenge players into actually completing and learning spy vaults.  Perhaps disabling gear and the operator while resetting energy to 1-2 cloaks worth between vaults.

As for the Simulacrum a spy related addon, maybe you could simulate all the vaults of a particular tileset or faction and set the difficulty.  The mobs needed to add to the vault could be a side quest to unlock the add-on, via synthesis.  The tilesets could be collected in a spy mission quest.