hi, i just woke up and had a dream of an uber.
in terms of mechanics it seems similar to collecting the scrolls and ring for the ring of pride at the void uber but idk if it was a remake of that uber or a new one.
the setting is on a big map in river of flame style. however its not a river (coherent path), its a lava sea with individual, larger islands in it. the uber is also divided into multiple maps (like 4-5) that can be accessed through portals like the one that leads to the kabraxis uber.
as with the void, the objective of the uber is to find a number of uber bosses and kill them for their reward. however for this uber, its unknown (and random) where the uber bosses are located (at all. all there is to know is that they are on the islands and that more than one boss can be located in a level).
another "cool" (imo) feature of the uber is that the uber bosses are actually visible on the map like hadriel is in the river of flame (basically a red cross with the bosses name above it), however this red cross isnt actually created by the boss itself, but rather by an invisible monster that cant be killed and is just there to mark the spot, that wont move or go away once the boss is dead. this is simply for style and to make it easier to locate the bosses since the levels are so big.
thats it. more of a design than a mechanic dream, but well. hope this was at least a little bit entertaining