Gou Is the Sixth Child at the Border, I Kill the Warlord with One Arrow

The human kingdoms are alienated from each other, the undercurrent of the elven forest is raging, the dwarves are smuggling arms, the throne of the orcs is changing, and the abyss demons and frozen undead are waiting for opportunities. Every inch of the Aylan continent is bleeding for crowns. But Ryan had no interest in any of this. He is a border individual with a proficiency panel, majoring in stealth, poison making, rune archery, and... Retreat route planning. He never charges into battle or gets involved in a country-destroying battlefield. He would only shoot the commander's neck with a poisoned rune arrow a few hundred steps away, take away the most valuable loot on the battlefield, and then sell the army's supply route to their mortal enemy at a high price.