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 place found near the Wastelands in the Realm of Outworld.
This entire lake was filled with blood. 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 traveled the sea through boat were often challenged by bloody Undead skeletons that boarded their craft and attempted to kill the living.