Lord of the Jammed

The Lord of the Jammed spawns when the player's Curse reaches 10. He cannot be killed, and continually chases the player, swinging his scythe and firing bullets in all eight cardinal directions.

If the player enters a shop while Lord of the Jammed is pursuing them, the shopkeeper will hide and items will no longer be purchasable. If the player is fast enough, they can still purchase Items before they disappear.

Trivia

 * The second part of his Ammonomicon entry is a reference to the 1984 film The Terminator, in which the character Kyle Reese uses the same words to describe the titular android.