Jack-o-turnip

Jack-o-turnip is a spawner-type building associated with the Effigy of Malice. It functions as an altar that can generate a new spawn every 25 seconds, making it a periodic source of enemies or objects rather than a static decoration.

Its spawn table is weighted, with the most common outcomes each having a 43.2% chance, while a rarer outcome has an 8.6% chance. Each of these rolls can also produce starred versions, with the source listing 2.2% and 0.1% chances for the starred variants in the common entries, and 0.3% and 0.1% for the rarer one.

In practice, this means the Jack-o-turnip is built around repeated, timer-based output rather than instant or player-triggered use. If you are dealing with one in the world, expect it to keep producing on a fixed interval until it is removed or otherwise disabled.