Class-Changed into a Corpse King, I Build an Army of Blood Zombies!

[System Upgrade + Endless Corpse Transformation + Legion Building + Slow Pace + Dungeons] Five years ago, dimensional gateways connecting to another world opened without warning across the globe. Terrifying monsters and cultivators poured through the gateways in an endless stream. The armies of every nation were forced to retreat, suffering heavy losses. Only after paying a terrible price did humanity manage to wipe out the first wave of invaders. Yet the eerie gateways continued to hover in places around the world. To close the gateways for good, nations poured their resources into training special warriors to venture into the other world. As wave after wave of “Slayers,” each with different abilities, emerged, one gateway after another was shut. But new ones kept appearing... To raise the exorbitant sum needed for his mother’s surgery, Fang Shi resolutely chooses to take the perilous Slayer assessment. But who could have guessed that on his very first trip into a gateway, he would face a terrifying hidden challenge? At the brink of life and death, he unexpectedly obtains the Corpse King System! [Congratulations, Host, on unlocking the hidden class: Corpse King] [Congratulations, Host, on unlocking the hidden Blood Corpse unit: Blood Wolf Cavalry] [Congratulations, Host, your Blood Corpse army now numbers over ten thousand!] Fang Shi: “I had no choice. From the day I became a Slayer, I’ve had only one conviction: keep getting stronger so I can survive!”