Kill the skulls and then the urns that become attackable. This will remove the ice blocking the way to the room at the top of the ramp.
Talk to the Shade of Miragul then kill the two nameds in the two underground crypts, Faenelae and Blood Sucker to unlock the chests near them; collect the arms and legs from these chests. Then give the body parts to Shade of Miragul to spawn the Atrocious Amalgam. Kill the named then come back to the start and kick a barrel at the Epic x4 shadow beast. Head past the ice flow and match the runes with the color poles and fight replicas of your party. Then swim under the ice flow into a hole, and kick Patriae Vykel to the curb.