OK, so the players now know that the strange black waterfall is extraplanar matter from the Plane of Shadows. Great! Now how are you going to get past it?
By walking around it? In the OP's description, the black sludge is just kind of...there.
Originally Posted by Inevitability
Greater
\ˈgrā-tər \ comparative adjective
1. Describing basically the exact same monster but with twice the RHD.
Originally Posted by Artanis
I'm going to be honest, "the Welsh became a Great Power and conquered Germany" is almost exactly the opposite of the explanation I was expecting