Shrink and destroy the mass of steel (Argath, Bastion of Illdaera)
You will need to go back and forth between the water reservoirs close by and the mob in the center (as indicated by
on the map), you have to click the item on it to shrink it, while doing so steel droplets will come, you can use the water to stun them, if a steel droplet gets to the center mob it will get bigger and need another water click on it
You can also just burn it outright and kill it without needing water and you can range it since it does not summon
You can go back to and Hail the Attendant to respawn the mass of steel
on the map)
on the map)