Korvosa is cursed by virtue of the Crimson Throne
Varisian fortune teller who brought the PCs together at the beginning of the campaign
Zellara was a fortune teller whose son got mixed up Gaedren Lamm. After confronting Gaedren about her son she was murdered and her head and harrow deck kept as trophies by Gaedren. Her spirit living on in the material plain contacted the PCs to defeat Gaedren and retrieve her items. After the defeat of Gaedren Zellara possessed her original harrow deck and now follows the NPCs in spirit form.
Occasionally her image will appear as an illusion generated by the deck itself where she can perform harrow readings and identify items. Her goal from what the PCs understand is to defeat the likes of individuals like Gaedren Lamm who threaten the good people of Korvosa.