The Summoning Circle is a limited-time decoration that was released on October 3, 2018, as part of the Treehouse of Horror XXIX Event. It was the fourth prize to be won at the Old Ruins in Act 1. Additional ones can be crafted at the Holy Forge. During the event, it added a 1.60% Curse Bonus in the bonus area of the Old Ruins.
- It can be placed on grass, pavement, dirt, boardwalk, pier, edge of boardwalk, or edge of pier.
- It can also be placed on krustyland path.