Magma the Volcano God

Magma the Volcano God is a prehistoric lava entity that lives in a volcano and guards the Chaos Emerald of Life. He does not allow anyone to have the Chaos Emerald unless they first make a sacrifice to him. The sacrifice must be thrown into his lava. However the lava is actually volcanic mud, so the sacrifice is not destroyed, it just gets messy, as is what happened to Scratch and Grounder when Robotnik sacrificed them.