The Earth God is a character that debuted in Mortal Kombat Mythologies: Sub-Zero and acted as one of the bosses.
He was one of four guardian gods assigned by Raiden to guard the Amulet of Shinnok in the Temple of Elements and acted as the god of earth in the Mortal Kombat universe. His appearance was of an immense, slow-moving man made of rock. He could be beaten in traditional hand-to-hand combat or a chandelier could be made to fall on him. He was defeated by the elder Sub-Zero, allowing the ninja access to the water area of the temple.
In the official Mortal Kombat 4 comic that came with the PC version of said game, the younger Sub-Zero attempts to make peace with the temple guardians, but discovers that they are gone. This could indicate that the Earth God was killed by Shinnok during his invasion, an idea further substantiated by Fujin's Mortal Kombat 4 biography screen stating that he and Raiden are among the few surviving Earthrealm gods.