Day per Ten Thousand 

Lu Li transmigrated and became an apprentice in a Demonic sect. He was also given the Martial Art System.
He could automatically cultivate any technique as long as he learned it.
But.
[Your Blood-Devouring Demonic Technique is feeling sad as it has not absorbed human blood. Cultivation level decreased.]
[Your Heart-Shattering Palm Technique is not satisfied as you have only been killing animals. No progress with its cultivation level.]
[Your Seven Kills Fist Technique is very dissatisfied with your kind heart. Cultivation level decreased.]
[Your Ghostly Steps Technique does not have enough energy as you have not fused with the soul of any ghosts or spirits. No progress with its cultivation level.]
......
Lu Li had no other choice when he read the system notifications.
Thus, he started to cultivate orthodox techniques in the Demonic sect.

EndlessFantasy Translation 

Passive Cultivation: Becoming Buddha In A Demonic Sect

matchatranslations

Lu Li was shocked. He looked at Crimson Lord carefully, and a trace of surprise flashed in his eyes.

Crimson Lord also looked at him with a smile.

There seemed to be a hint of profound meaning in her smile.

In the next moment, Lu Li nodded slightly to express his gratitude. Then, he went back to Demonic Devil's side. Without looking at anybody, he silently activated the Mystical Devouring Technique and devoured the qi of the sun that he had just refined.

At this moment, Demonic Devil said coldly, "The guests are almost here. Serve the dishes. Everyone can leave after finishing their meal."

At that moment, Bai Jinfei voiced out, "The guardian of the Scripture Depository has arrived!"

Then, a white-haired old man with a human skull necklace on his neck appeared.

It was the old man from the Scripture Depository!

Lu Li's expression turned serious.

Unethical