Sh'eenaz is a siren or mermaid who fell in love with a human duke, Agloval. In this story, the prince initially hires Geralt to convince Sh'eenaz to abandon her home in the sea to live with him on land.
She appears in "A Little Sacrifice" a short story in the Sword of Destiny collection by Andrzej Sapkowski.
In The Witcher computer game[ | ]
When Geralt meets the Lady of the Lake, the latter tells him that she has heard of the witcher "on good authority", meaning that she has heard it from Sh'eenaz.