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Heroscape: The River of Blood

The Underdark. None in Valhalla knew that such an expansive world lay just below the surface of their own. Somewhere in that twisting underground maze might lay the secrets of the lost civilization that built the wellsprings. You are the leader of an adventuring party, sent into the Underdark to unravel its most recent mystery. Along one of the well-scouted passages, lies an underground lake. Recently a horrific number of mutilated corpses have been discovered floating in its waters, apparently carried there by a river that feeds into the lake. Now christened the River of Blood, it stretches back into an unexplored region of the Underdark. You have been tasked with following that river and discovering the source of the bodies that float down its current.

The rest of the mod required to play is here.
http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=372979678

Map Rules:
https://docs.google.com/file/d/0B4bER3ZONV0NbnpnQjMwS2lrRDA/edit
(Ctrl+F The River of Blood to shortcut to rules)