[Although Devouring Immortal Bead didn't show much performance in your previous life simulation, it doesn't mean that the Devouring Immortal Bead is weak. After all, your cultivation was indeed weaker at that time.]
[Now that you have become a quasi-Fairy, even your incarnation carries power not inferior to ordinary Dark Psuedo Immortals, and may even be stronger.]
[Therefore, with your current strength, you can fully unleash the power of the Devouring Immortal Bead. If you want to use it in battle, devouring a Dark Psuedo Immortal is very easy.]
[As for why in the previous simulation you couldn't use the Devouring Immortal Bead against Leng Yue and gain an advantage after using Moment of Elegance to raise your battle power to the highest level, it is because Leng Yue was too strong, and she also had Immortal Artifacts.]