The Stone Monkey, also known as the Grave Monkey, is the guardian of Rampant Ruins in Skylanders: Swap Force. For thousands of years, it has stood over the robot cemetery, stomping on robots that attempt to rise from the grave and sometimes seen eating large bananas.
The Skylanders activated the Stone Monkey in their fight against Evil Glumshanks. Upon being activated, the graveyard guardian approached the evilized troll and stopped him from continuing his operations that disturbed the ruins. However, Evil Glumshanks retailiated by ramming his Arkeyan tank into the Stone Monkey, knocking them both over the edge of the cemetry. It is unknown what became of the Stone Monkey.
Environmental concept art of the Stone Monkey overlooking Rampant Ruins.