High Martial Arts and Immortality? but I Am a Female Devil

[Big heroine + half-dark + half-brained + decisive in killing] I was once a female devil who transcended the tribulation realm in the world of immortality, but I was accidentally reborn in a city where spiritual energy was revived. I became a useless student with the lowest qualifications. The law protects mortals? Very good, I have a hundred ways to make enemies disappear "accidentally". Seizing spiritual roots, swallowing resources, stepping on corpses, until the hypocritical mask of this world is torn apart - it turns out that the so-called spiritual energy recovery is just a carefully arranged hunting ground. Then let's see whose rule is the one who survives in the end.