My System is Too Over Powered

[Ding! You have spent 10,000 Universal Coins and purchased the Shadow Monarch Class.] ...... A hundred years ago, a mysterious virus swept across the world and changed everything. Animals mutated into terrifying monsters. Entire cities were overrun within months. Governments collapsed, civilization crumbled, and billions perished beneath endless tides of beasts. Humanity survived only by retreating behind colossal walls and establishing fortified base cities. Amid this chaos, martial warriors emerged. Through cultivation and relentless training, they pushed their bodies beyond human limits. They could shatter steel with their fists, outrun speeding vehicles, and battle monstrous creatures that would have once been considered natural disasters. In this new era, strength became the law. The powerful stood at the top, while the weak struggled merely to survive. Ethan was not one of them. At least, not yet. Like many protagonists from the stories he used to read, Ethan was a transmigrator. He had crossed into this world years ago carrying memories from another life. Unfortunately, unlike those fortunate protagonists, he had never received a cheat, a golden finger, or any special advantage. He had spent years living as an ordinary person at the bottom of society. Everything changed on the day he received his first salary. [Ding! The host has come out of his pauper condition.] [Ding! The Infinite Shop System has been successfully activated.] That was the system's first message. Its function was simple. As long as he had enough money, he could buy anything. Legendary bloodlines. Godly talents. Supreme cultivation techniques. Mythical classes. Even the powers of gods themselves could be bought. And thus, Ethan's journey began.