Nightmare Child

The Nightmare Child was an area large enough for a ship to fly through the mouth of, it was near the Gate of Elysium, during the Last Great Time War.

Davros' ship was damaged near the Nightmare Child and the Doctor witnessed him fall into its jaws, and attempted to save him.

Dalek Caan, who escaped from 1930 using an temporal shift flew into the jaws of the Nightmare Child, saving Davros in the process. (DW: The Stolen Earth)