Argelmach stands in a private room of the Manufactory, guarded by two elite golems. If threatened, Argelmach will draw all living Manufactory technicians and golems to eliminate adventurers. Before taking him down, adventurers would probably find it advantageous to kill all mobs in the Manufactory first to lessen the difficulty of the fight.
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Although Golem Lord Argelmach in the game is both considered humanoid and "flesh", the quest Rise of the Machines reveals that he is actually a machine. He is replacing the original Argelmach which was killed by Lotwil Veriatus.
Chain Lightning - Strikes an enemy with a lightning bolt for 278 to 322 Nature damage that arcs to another nearby enemy. The spell affects up to 5 targets, inflicting greater Nature damage to each successive target.
Shock - Instantly throws a bolt of lightning at an enemy, inflicting 273 to 293 Nature damage.
Lightning Shield - Surrounds the caster with 3 balls of lightning that have a 50% chance of striking melee or ranged attackers for 4 Nature damage. Each time the lightning shield strikes, a ball of lightning dissipates. Thus, the shield expires after 10 min. or after it has struck 3 times.
Find and slay Golem Lord Argelmach. Return his head to Lotwil. You will also need to collect 10 Intact Elemental Cores from the Ragereaver Golems and Warbringer Constructs protecting Argelmach. You know this because you are psychic.