Expanded Delvs

So I dont know if anyone played the Division 1 and they did a rework of the Underground,. Buyt they set it up as a 3-5 area thing. It was RNG Assets set up to randomize what levels you got in that theme. They could do this for so many things and also increase the levels as well. They would be based off skill and how you play rather than pure gear numbers.

Something like this could be lots of fun and very evergreen for the game. Thoughts on this?