Angered by the incestuous relationship between the king and his sister, and the pregnancy it led to, Ostrit cursed them, though it's unclear if it was him or the siblings' mother Sancia of Sodden (who also disapproved of the relationship) who ultimately caused the curse.
Both the mother and the girl-child died during the labor, and they were buried. Several years later, the curse bloomed and the girl rose as a striga, haunting the streets of Old Vizima. Ostrit was killed by the monster when Geralt of Rivia used him as a bait to draw the striga out of its crypt.
- He appears in the comics where the story about the striga is re-told.
- In The Witcher intro, he's used as bait for the striga.