The Darkling River works its way through the underdark beneath the grey hills to depths unknown. This is the eleventh location along the Darkling River and the Darkling Lake beyond.
At a confluence of a tributary of the Darkling River and a tunnel through deep gnome territory, Bloodmarket Cave is used by a number of groups to trade with a group of mysterious grey-robed humans that are assumed to be slaves / operatives for an unknown mind flayer colony. They offer black adamantine coins in trade for preserved sapient brains stored in special metal canisters. They take the full canisters with them and leave behind empty canisters to continue the trade.
They seem to teleport in to make the trade, never quite at the same spot, and usually within 40-60 hours of traders arriving in the cave with…
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