Lady Bane

She is the second hardest, or easiest of the three witches. She'll cast hard-hitting spells such as ice bolt, enervation and most the nasty high-wizard spells. She also has a script to randomly cast anti-magic sphere, this can work to your advantage, as I'll explain in a moment. First, from recall, go west, north, east until the second south, go north until west, west, northwest, all south. Search in this room to reveal an exit to the west. Go in to the west, down and north. Lady Bane can wander around these entire crypts, so you could run into her before you get to her normal room. Be prepared, if she's not in her normal room and is still alive you'll need to seek her out. To get to her repop room, go all north, all east, south, all east, west and north. This is a CPK room, as is the room north where Lady Bane repops. Open the north room and attack her, then flee to let her out. Wait in the NPK two south of her room. If she comes out, flee into the room she's in, and close the door north to prevent he going back in. Once she's out you can attack her.

Either dispel her with dispel magic, or cast as many affecting spells on her as you can to make her dispel herself. Then poison and plague her, to stop her regening. Begin enervating her, if you can and if not, just heal yourself until she casts antimagic sphere. If she webs you, make sure you calm to help you outlast it and if you can attack one of the weaker mobs in the room. She'll die rather easily, especially if you're in a form.

You can loot a mirror amulet from her, which summons hunters and a leopard skin scroll which contains the spell antimagic.