The Dancing Girl, as shown in 792.
The Dancing Girl was a curved, wavy knife that belonged to Aristede (792). He later calls it "The Dancing Lady" (810), although this was probably a mistake on Michael Stroka's part (unless Aristede just had a complex narrative in his head about The Dancing Girl, and felt she had "grown up" by that time).
Aristede states that The Dancing Girl was made by a Persian swordsmith (792). The design is very similar to the Kris daggers of Indonesia.
A dagger with a wavy blade has a significant advantage over one with a straight blade – those with wavy blades are able to slide off bone and can therefore pierce deeper into the victim.[1]