Cnidarian

The Cnidarian is a craftable Pre-Hardmode yoyo. While it is thrown, the yoyo will fire out small seashell projectiles when enemies are nearby. Seashells pierce once, return to the player after a short time similarly to boomerangs, and deal 75% of the main throw's damage. When the yoyo returns to the player, it will be automatically re-thrown if they are still holding the fire button.

Trivia

 * Cnidarian is a term used for individuals of the cnidaria phylum, which contains organisms such as anemones, corals, and jellyfish.