To kill this golem, you must first kill the nearby Forge Imps to spawn the Flux Matrix. Pick it up, run to the Energy Generator to charge the Matrix up, and drop it in front of the golem. 2 drops will kill the golem.
Life stealing and health loss skills such as Spoil Victor will also help kill the golem.
This creature uses the "Sinister Golem" skin, which a player can turn into by using a Sinister Automatonic.