Serapis' Staff is a magical staff owned by the Graeco-Egyptian god Serapis.
The staff has three heads in the form of a lion, wolf, and dog.
The three heads of the staff represent the past, present and future. Using it, Serapis gains control over these three aspects of reality. When the future part of the staff is destroyed, Serapis is destroyed along with it.
Annabeth Chase finds the lion and the wolf heads of the staff in the subway and follows them. Later, she meets Sadie Kane to find the dog head and learns that the staff is controlled by Serapis, who in turn is working for an enemy familiar to Sadie.