Quagmire

The Quagmire is a craftable Hardmode yoyo. While in use, the yoyo randomly and continuously emits spore clouds which deal 50% to 70% of the yoyo's damage. Only the yoyo itself inflicts the Venom debuff. When the yoyo returns to the player, it will be automatically re-thrown if they are still holding the fire button.

Trivia

 * A quagmire or mire is the general name for wetland areas such as bogs, fens, marshes or swamps.