WeaponOut/Patchy Pounder

The Patchy Pounder is a Hardmode, post-Plantera  with 11. It has a chance to be dropped by Pumpking if defeated with any Fist weapon, with the chance increasing with the current wave number in the Pumpkin Moon. Striking enemies will inflict the Pumpkin Mark debuff. Performing a successful parry with the Patchy Pounder causes the player to perform a counterstrike, dealing up to 1460 damage, providing the buff, granting an additional 357 bonus damage and causing all marked enemies to explode, dealing immense damage.

Trivia
The color scheme and debuff that this weapon applies are a reference to Brachydios, from the Monster

Hunter series, Brachydios uses punching attacks and inflicts a debuff that causes you to explode.