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Sensibility Bustle
From Discworld & Pratchett Wiki
Dr Bustle was a powerful wizard at Unseen University. He was an expert on ancient languages.
He decided to try to capture a Hiver as part of his latest dissertation. Unfortunately he succeeded. The Hiver willingly accepted this power and then - as is its wont - took over Dr Bustle and used him to further its own ends. It ended badly, as these things tend to do.
Centuries later, when the Hiver invaded the body of Tiffany Aching, the ghostly memory of Sensibility Bustle awoke now and again (along with an ancient desert queen who killed ten of her husbands with scorpion sandwiches, giant lizards and sabre-toothed tigers - all the most powerful members of society on the Disc at the time).
When the Hiver was defeated through kindness, and disappeared across the Desert, for some reason the memory of Dr Bustle remained with Tiffany, and occasionally stirs to prompt her with erudite information or the translation of obtuse old words.
