The Arrow of Dodona was 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, the answers vary from how to make a plague arrow to giving driving directions to the Cave of Trophonius.
"SAYEST THOU: PLAGUEY, PLAGUEY, PLAGUEY." - Arrow of Dodona