Abyss of Demons isn’t worth running/grinding. Its Treasure room is pretty hard to come by but maybe that’s just me. It’s tedious, and I don’t understand why the lava bridges slow you down despite being necessary to cross more than half the time. The enemies are cool, but they can be pretty deadly for a mid-level dungeon.
I think it’s best to compare it to UDL, since they’re both long and drop (IMO) equivalent potions. UDL is much faster to farm since it doesn’t have those lava bridges and you can circle enemies a LOT easier, so rushing is safer. Also, Trooms are much easier to come by but again, might just be me.
A change to Abbys doesn’t have to sacrifice DECA’s vision for it, which is a dungeon that teaches you map hazards, navigation, and the importance of Defense. They could make lava bridges less annoying in corridors, and brutes harder to aggro through walls. I still don’t know why you can’t see enemies through walls when the UDL doesn’t have that feature anymore.
It’s not fun crawling on a lava bridge only to get jumped by brutes that have already lined up to eat my poor rear.
Edit: I find it easier to just farm Woodland Labyrinth (the easiest of all epic dungeons). Better whites too. Which is a shame.