Changed Job to Corpse King, and I Relied on Corpse Transformation to Create a Blood Corpse Army!

[System upgrade + unlimited corpse transformation + legion flow + slow pace + copy] Five years ago, cave-like passages to different worlds opened without warning all over the world. All kinds of terrifying monsters and monks poured out of the passage in a steady stream. The armies of various countries were retreating steadily and suffered heavy losses. After paying a heavy price, humans barely eliminated the first batch of invaders, but those weird passages are still suspended everywhere. In order to completely close the passage to the cave, various countries have devoted their resources to training special warriors to go deep into other worlds. With the birth of batches of "crusaders" with different abilities, the passages to the cave and sky were closed one after another, but new passages continued to appear... In order to collect the sky-high surgical fees needed to treat his mother, Fang Shi resolutely chose to participate in the extremely dangerous crusader evaluation. Unexpectedly, the first time he entered the cave, he encountered a terrible hidden challenge. At the moment of life and death, he actually obtained the Corpse King System! … [Congratulations to the host for unlocking the hidden profession: Corpse King] [Congratulations to the host for unlocking the hidden blood corpse unit: Blood Wolf Cavalry] [Congratulations to the host, the current number of blood corpse troops exceeds 10,000! … Fang Shi: "I have no choice. From the day I became a crusader, I have only one belief - to keep getting stronger in order to survive!"