I just want to let those who don’t know yet be aware.
If you are thinking about clearing your nightmare dungeon keys from inventory.
Do not click salvage “All KEYS” or “Mark your Tributes” first
Tributes are counted as keys and salvaging Tributes completely remove all their stack.
I just did one miss click and all my saved Tributes are gone, Ascendance, Radiance, Refinement, Harmony, Titan, etc…
My friend just told me later that he also made the same mistake.
Yes, It is my mistake but I think especially on Tribute it should be removed by only one per action, not all the stack.