"Oh, just don't touch the city walls of Dis. The rest of the place? It's fine. I mean you get devils, but you killed a couple Excruciarchs, they're stronger than most of the residents of Dis. Think of it like this: The big cities are much stronger than the rest of any given layer. So outside of Jangling Hiter and the carried city, Minauros doesn't have too much in the way of deadly devils. In the layer of Dis, it's fairly safe. In the city of Dis, you'll find trouble.<br/><br/>Go down into Phlegethos, and the fire is bad, but it's not as though the ground and sky are made of fire. Just don't go near the flames, and don't lie out in the open for too long, and you should be okay. Again, the devils are worse in the major cities, and you may wish to choose who you side with in that place - the Archduchess Fierna, or the shadow-ruler Belial. Word has it they're slowly drifting apart, having a lover's spat, maybe?<br/><br/>Now the Black river, it isn't in Jangling Hiter. You'll notice we're hanging above the actual layer. But if you took a running jump, and flew, you could maybe hit a waterfall. You don't want to do that though. Immerse yourself and you'll start to forget who you are.<br/><br/>No, you'd need to find it on an actual layer - like in Minauros proper. Just look for where the water is more black than brown and you're on the right track. It could then take you from anywhere between Pandemonia and Acheron, and some rumour it leaks into other planes as well."