D'yaebl is the Elder Speech word for devil.
D'yaebl is a steel sword given to Geralt by Velerad as a gift from King Foltest at the end of Her Highness the Striga in Chapter V if he cures Princess Adda a second time. It is used primarily against humans and has little effect on monsters. The sword is supposedly coated in dragon blood. Also carried by Azar Javed during the end of Chapter II.
- The word D'yaebl sounds very, very similar to polish word "diabeł" meaning "devil".