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Warning: This entry contains spoilers for the book Lords and Ladies.

Self-taught witch of Lancre (or she was until Granny Weatherwax found out). She was born Lucy Tockley, but called herself Diamanda because it sounded more 'witchy'. Indeed, she does paint her nails black, and wears black lace and a floppy black velvet hat with a veil. She did, and taught to a small group of girls including Agnes Nitt, all the other necro-nerdy things that people do when they are young and therefore immortal (such as candle magic and 'the cards', presumed to be the Caroc Cards referred to in other chronicles of the Discworld, containing, as is said, the distilled power of the ancients).

For a seventeen year old girl, she showed an impressive amount of power (to the extent that she had a battle of wills with Mistress Weatherwax, which she lost only by being too competitive), but it was discovered by Granny that this was gifted to her by the Queen of the Elves. This bargain took its toll on Diamanda in the events which followed. Already in thrall to the Elves, she is wounded (elf-shot) by one of their arrows after entering the Dancers, and only Esmerelda Weatherwax saves her life and gets her out again. In a deep sleep, she is tended to by Magrat Garlick who patches her physical wounds, but she is awoken to allow elves to enter Lancre Castle. They show their gratitude to her by inflicting further wounds, and it is probably after this incident she renounces involvement with witchcraft - although in the last few pages of Lords and ladies, there is a strong indication that just as Esme Weatherwax and Mustrum Ridcully had a summer romance in Lancre many years ago, she hasn't renounced an involvement with one particular wizard.

There is no indication that she continued with witchcraft, or this would surely have been touched upon in later books featuring Agnes Nitt and Tiffany Aching.