Royal Guards of Ethyria

The Kingdom of Ethyria is a utopia where gold, silvers, and mines were opulently found. Ruled by a King with exceptional skills, power, and strength to protect his people.
However, beyond the kingdom's richest, was filled with fear and doubt. Monsters with an evergrowing thirst for lust over women are just waiting to delve into the neighborhood's realm to feed on their flesh and blood.
What would the people do if the monsters lurking outside the kingdom decided to ransack their currently peaceful living?
Will the King's prowess to protect his people be enough to keep the monsters from harming them? Can the King fight them alone? Or he will finally find unexpected allies among the monsters?