Ares is a bat that lives in the Underland. He was the once bond of Henry but later bacame Gregor's bond after Henry plotted a plan with the rats that Ares din't know about. Gregor jumped into a gorge to save his friends, and Henry fell in as well, thinking Ares would save him. However, Ares saves Gregor and Henry falls to his death. Gregor bonds with Ares to save him from being executed for letting Henry die.