Liu Kang and Sub-Zero defend themselves against the seige of undead Bloody Skeletons at the Sea of Blood
The Sea of Blood is a dangerous locale found with the Wastelands in the Realm of Outworld.
This entire cursed lake filled with blood was located near the Wastelands. The souls of the dead that die there are put to use with their bodies added to the sea of the blood of the damned. Those that travelled the sea through boat were often challenged by bloody Undead skeletons that boarded their craft and attempted to kill the living.