Leviathan

The Leviathan is a cosmic entity from the comicbook series The Unwritten most times depicted as a huge whale, similar to Moby Dick. It either is or contains the collective consciousness of everyone that experiences stories, and it forms a symbiotic relationship with the worlds; it eats stories and in turn these stories are sustained. The Leviathan has special connection with the series protagonist, Tom Taylor and is the source of Tom's abilities.

The Leviathan is what keeps Pullman alive leading to his long quest with the aim to kill the beast.