???

??? is a Pre-Hardmode stationary enemy that spawns in the Ocean. When it is killed, it summons Anahita. In Revengeance Mode, it can drop the powerful Aquatic Heart accessory at any point in the game. It can also be detected by the Lifeform Analyzer.

Trivia

 * When ??? is nearby, the song Siren's Call, which was composed by the artist DM DOKURO, will play unless the Calamity Music add-on mod is disabled.