The value of verticality is also questionable since bridges which you can walk over and under are impossible in the engine. Some has been added back in with height bonuses for archers, and D:OS 2 makes plenty of use of varied height, but the game also usually encourages keeping your party together, and this design seems to make it difficult to go back and forth between areas of different height without a lot of backtracking.
I had in mind stairs which leads to upper floor level (the sphere sign). This can be achieved by seamlessly loading the upper level or through loading screen.
Verticality of the level can boost the exploration value.
