Subdual of Silan

You've arrived again without fail. Bulcan-type monsters are really tenacious. The giant Bultures seem to be the most powerful of them all, but that's not true. Across the creek outside of Moradon in the farthest outskirts dwell human-sized Silans. They are normal sized but their muscle strength and physical power are incomparable since they primarily feed on underground iron bars. With their numbers continuously escalating, we need to wipe them out for the safety of the residents. Those shoddy mercenaries were no match for them. That is why I'm asking you.