Mirror Prepayment

Thrust into another dimension—a world of nothing but monsters and combat—he discovers a unique cheat: he can "borrow" the rewards of a battle before it's even won. He can claim equipment, experience points, gold, and even a perfect Mirror Image of his foe in advance. The catch? He must defeat the original enemy to keep his spoils permanently. His ultimate goal: to collect and cultivate a legion of these Mirrors, turning each one into a Grandmaster of its class. He can then "log in" to any of his creations, becoming a one-man army capable of fighting as a hundred. In this world, sheep move in flocks. Tigers hunt alone! (Source: Tencent, translated)