Terrible Terrors originated when Persephone was lonely in the Underworld. She created Terrible Terrors to be her pets but she eventually forgot about them and they escaped into the Upper World. So when Terrible Terrors die, their souls go back into the Underworld, to return to where they were created. At first, Terrors were ignored by the Ancient Greeks since the larger dragon breeds came off as a bigger problem but Terrible Terrors got up there with Monstrous Nightmares when they started accidentally spreading the Black Plague in the 1300s. In the 1600s, Terrors started to stowaway on ships and started colonizing in America ... and the rest is history.