The Witch is the stage at which the path finally becomes mystical, and the first thing the canon reports about her is unusual: advancing to Witch makes the bearer a woman regardless of her original sex.
Charm — appearance and allure increase significantly;
Dark Magic — its forms are granted by the potion itself, and although the Witch is able to study other dark magic as well, what she receives is usually enough;
Mirror Magic — she commands mirrors in a multitude of ways;
Divination — at this stage the Witch gains considerable divinatory abilities, naturally mastering the magic mirror and staff divination.
The method of action is formulated in a way that speaks more of drawing closer to the deity of the path than of behavior:
become a true woman, a natural instigator of disorder, thereby drawing nearer to the primordial "Her";
and the key lies in remaining close to mystical dangers.
The latter is a general rule for the entire branch: the Demoness grows from closeness to that which should destroy her.