Random Dungeons (Tower-like content)

I want to see Towers being spawned at random when you finish a map, like some sort of underground zone that spawns a "dungeon" which is the same as a Tower when you re-enter the same node after its completed.

That way we could have more overlap of content and Tower scarcity won't be a huge problem. it would lead to some crazy scenarios where you could actually get maps stacked with crazy amount of rarity, but GGG can cap the amount of the same tablets affecting a map.