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Dong Quixote's beloved, who like the dancer Tart drifted into mercenary work and disappeared.
Mentioned by Dong Quixote at the close of his story about the kobold dancer named Tart. After explaining how that Tart was demoted to the High Class Bitches bargain rack, fell out with the madam, became a mercenary, and vanished, Dong said the same thing happened with his beloved Corcunda.
A lost love of Dong Quixote's, invoked in his account of dancers turned mercenaries.
Also appears in books you've already read — spoiler-safe to their endings: