My Cultivation Level Is Maxed Out, and the System Forces Me to Collect Waste

[System] [Qi Refining, Foundation Building... Overcoming Tribulation, Mahayana] [Protect the Calf] [Dirty Skewer] Ye Xuan took the system through the world of cultivation. He had reached the full level of cultivation without knowing it, but the mission of the system was to recruit the most useless disciples. The more useless the disciples, the richer the rewards. What a tragic mission this is.