Not only are there not enough purifyers to cover the dungeon, but there are none in the boss room wich makes it quite hard with the constant debuff.
You know you’re suppose to pick them up again after dealing with a room… you’d end up with 6+ of them by the end. 
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Wrong version of the delve.
In this version, you cant pick them up.
You stomp at the purifyers and get what you get…
I did it today at T11 and there is one behind the boss