Deep Sea Orb

The Deep Sea Orb is an Reforge Stone added in the 0.9.10 update. You can only fish them up for 1 hour during a Spooky Event, 1 hour before, and 1 hour after. It is a rare drop from the Werewolf (Fishing 17), Phantom Fisher (Fishing 21), and Grim Reaper (Fishing 26). It is used to apply the Submerged Reforge to Armor. The reforge gives and. It is only Armor Reforge that directly grants, making it very useful for fishing. This reforge gives more Sea Creature Chance than Renowned (due to Renowned being multiplicative and Submerged being additive) and is significantly cheaper so it is the go to reforge for armor sets such as Shark Scale Armor and Diver's Armor.

Trivia

 * This item appears to be a Re-Colored version of the Revived Heart