From the release:
Just in time for your Halloween games.
King Jack is the leader of the Killer Pumpkins found in the Storybook Wars Section of the Victory Store.
He is Stronger and more vicious than the rest of the Killer Pumpkins
Like the others, his strength comes from the Earth. He has many twisted vines that grab and tear apart his victims. A top his head, and between his gnarled horns, is a vine he can use as a whip to thrash his target.