I, the Demon Cultivator, Create a Back Garden for the Apocalypse

Chen Fan traveled to the world of cultivation and was taking the entry examination of the Blood Demon Sect. The Blood Demon Sect stipulates that within three days, one must either meet the assessment standards and become a disciple of the Blood Demon Sect, or be refined into blood crystal by the Blood Demon Sect. In order to survive, Chen Fan worked hard to practice, but still failed to meet the assessment standards. In despair, Chen Fan awakened the portal system, He can travel to the doomsday world, kill zombies, obtain blood crystals, improve his cultivation, and complete assessments. While the disciples of the Blood Demon Sect were still fighting to the death for blood crystals, Chen Fan could easily obtain endless blood crystals in the apocalyptic world! While the disciples of the Blood Demon Sect were still on tenterhooks and cautiously surviving, Chen Fan was smoking cigars, drinking red wine, and eating big meals in the apocalyptic world! While the disciples of the Blood Demon Sect were still fighting for a piece of equipment, Chen Fan actually collected a complete set of legendary suits in the apocalyptic world! Chen Fan, why did he become the biggest devil in the world without killing anyone?