ok, here it goes. any hunter with decent equipment can beat any non-magic army.
monsters are magic and can't harmed by non-huners, that's the premiese. even armies can't clear gates or harm monsters.
hunters can have special equipment, but non-hunters can't use that equipment, and since theere is both offensive and defensive equipement, it must mean that even shitty armor gets the same power of monsters, and makes the wearer immune to non-magical damage. even if it just emmulates the defensive profile of a goblin.

do I believe this? of course not. but that's the setting.

speaking of which, what are all those crystals jinwoo gathered for? is there civilian use for them?