The Colossal Monolith was the name given to a particularly enormous Monolith, a type of Sithspawn, that existed on the desolate surface of the planet Ziost after the eradication of all life on Ziost. The Monolith was located in a large crater-like area on Ziost, surrounded by rifts and small craters that appeared to be releasing some kind of aura or energy. The Monolith could use this power to kill anyone who dared to attack it.