The Arch of Tantalus (introduced in Curse of the Warmbloods) is an entrance to the Jungle created from and surrounded by the bones of many creatures who met their demise in the Jungle. This is the place where Gregor and his party first encountered Hamnet, Frill, and Hazard. It is named after Tantalus, a Greek figure who committed a great crime and was set to be punished in Tartarus. As his eternal punishment, he was placed in a pool of water surrounded by branches filled with fruit. Though he had great thirst, the water would recede as he bent to drink it, and when he reached up to the fruit, the branches rose out of reach.