Over the next few days, Harley settled into a regular routine of studying magic under Grindelwald.
Although Grindelwald seemed to see the shadow of someone from his past in Harley and inexplicably disliked her somewhat, he remained extremely serious when it came to teaching.
The lessons themselves were simple. Grindelwald continually taught Harley how to use Fiendfyre, even passing on all his most closely guarded insights into the spell.
But Harley was not merely repeating the process of learning Dark Magic.
When using Fiendfyre, Grindelwald required Harley to focus all her attention and carefully experience the negative emotions it generated—the "desire to destroy everything," the "desire to annihilate everything," the "desire to see the whole world burn."
Yet even as she felt those negative emotions, Harley had to preserve her own positive state of mind and pure heart, without allowing the negativity to interfere with her.
As for how to cast off the corrosive influence of negative emotions, Grindelwald believed it was very similar to Occlumency.
The conventional way for ordinary wizards to learn Occlumency was to master a few tricks for emptying the mind, then have others repeatedly use Legilimency on them to create interference, thereby practicing the magic.
The training Grindelwald had assigned followed the same principle. The only difference was that the emotional contamination from Dark Magic could not be inflicted by someone else; Harley had to generate it herself, then resist it herself.
Professor Dumbledore, who had been watching from the sidelines, could not entirely accept this method of training, even with Grindelwald using Occlumency as an example.
After all, even if one failed to learn Occlumency, Legilimency would not cause irreversible harm to the target. At most, it would leave behind a few aftereffects that could be cured with Potion.
But if Harley were truly