From the waste of spiritual roots to the practice of asking the devil

Reincarnated in the cultivation world for sixteen years, starting from the waste of spiritual roots to ask the devil to practice.
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On the day of the test, the spiritual roots fell into the fifth level. It is difficult to break through the middle stage of Qi training in this life. The immortal gate will not accept it, and it is difficult to achieve immortality.
It happened that the Demon Sect was changing slaves, and those with low qualifications were plundered from all over the place as “spiritual slaves”. They used the Burning Life Magic to cultivate multiple batches of consumables, and made them sacrifice their cultivation to make spiritual sand for the Demon Sect to enjoy.
Wang Yu was plundered to the Demon Realm in Shihu City and entered the gate of the Demon Dao as a spiritual slave. Fortunately, he had the [Placement Bar] to solve many problems!
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[Placement Bar 1: Burning Blood Power]
“Burning Blood Power (0/100): 48 practices a day, and it can be achieved in one year.”
Ps: (The introduction is weak, move to the main text)