In the Poetic Edda, Attila partakes in this activity before dying. A group of Arcadian shepherds of theoak cult uniquely performed this activity to honor Zeus Lycaeus. Atreus punished his brother for sleepingwith Aerope by tricking that brother, Thyestes, into doing this. Humans turn into Wendigos by participatingin this activity. In order to get revenge on Tereus, Procne tricks him into partaking in this activity. Thisactivity is performed by Antiphates and his underlings, the Laestrygonians. For 10 points, name this actionthat Tantalus tried 
In the Poetic Edda, Attila partakes in this activity before dying. A group of Arcadian shepherds of theoak cult uniquely performed this activity to honor Zeus Lycaeus. Atreus punished his brother for sleepingwith Aerope by tricking that brother, Thyestes, into doing this. Humans turn into Wendigos by participatingin this activity. In order to get revenge on Tereus, Procne tricks him into partaking in this activity. Thisactivity is performed by Antiphates and his underlings, the Laestrygonians. For 10 points, name this actionthat Tantalus tried to trick the gods of Olympus into performing when he served them his son, Pelops.
In the Poetic Edda, Attila partakes in this activity before dying.
cannibalism [or eating humans; or more specific answers, like eating a son, eating a friend, etc.]