|“||SAYEST THOU: PLAGUEY PLAGUEY PLAGUEY!||”|
–The arrow to Apollo in The Hidden Oracle.
The Arrow of Dodona is an arrow that Apollo found in the Grove of Dodona. The arrow has an oak shaft and green fletching. The Arrow speaks to Apollo in an Elizabethan accent and gives answers to Apollo. The answers are not prophetic, though they vary from how to make a plague arrow to giving driving directions to the Cave of Trophonius.
The arrow is found in the Grove of Dodona by Apollo. He then takes it out and learns of its speech when the Colossus Neronis attacks the camp. The arrow re-teaches Apollo how to make a plague arrow, but the enchantment works too well and all the campers get hay fever.
While talking with Emmie and Josephine at the Waystation, Calypso suggests Apollo shows them the Arrow of Dodona but he refuses. He pulls it out at West Maryland Street for advice on how to rescue Britomartis' Gryphons, Heloise and Abelard. It advises them to go to the Indianapolis Zoo. The arrow later teaches Apollo and Meg McCaffrey how to drive to the Bluespring Caverns.
Apollo asks the arrow for help when they are being attacked by Strix. It tells him to use pig entrails, or abrutus if pig entrails are not available. While fighting the faded essence of Helios, it tells Apollo to have Piper shoot a blow dart at Medea.
While fighting Caligula's guards, Apollo uses it to shoot a cyclops in the eye; much in its annoyance and disgust. The arrow tries to stop Apollo from stabbing himself with it to no avail, however it moves away from his heart when he does stab himself, saving Apollo. Apollo calls upon the arrow for help when going through the oracle’s word puzzles.
After Apollo and Meg debate on whether to seek help from Percy Jackson or not, it sides with the daughter of Demeter in seeking him out.
After he and Luguselwa escape from their cell, Apollo retrieves the arrow and it guides him on where to go.
During the final battle with Python, the arrow informs him something is happening to him but says nothing more. It urges Apollo to use it on the monster. After much bickering, Apollo reluctantly stabs the arrow into Python's eye, blinding the monster and giving him a chance to kill him. After being stabbed into Python, the arrow, which remains intact, goes silent as its consciousness is destroyed. Though Apollo hopes that the arrow's mind returned to its grove, he suspects that it sacrificed itself and is gone for good.