Here are a few ideas:
1. The "Riptide" Reinforced: Tyson could forge a new handle for Riptide, the magical sword, out of a special metal that increases its durability and power. This could allow Percy to cut through more powerful foes and even make the blade stronger against divine attacks.
2. The "Kraken's Grip" Gauntlets: These gauntlets could be made from the hardened shell of a sea monster, and would grant Percy increased strength and the ability to summon a temporary kraken tentacle to grapple enemies.
3. The "Sea-Shepherd" Helm: This helm could be crafted from a special type of coral that allows Percy to communicate with sea creatures, enhance his natural water-based powers, and even see through water.
4. The "Storm-Bringer" Shield: A shield forged from a rare metal found in the depths, this shield could amplify Percy's control over water and storms, allowing him to summon powerful waves or create mini-hurricanes.
5. The "Cyclops' Eye" Amulet: This amulet would be a simple eye made of polished rock. It wouldn't grant any particular power, but would act as a conduit for Percy's own innate abilities. When in danger, it would pulse with a glow and give Percy an extra boost of strength, speed, or intuition.
Of course, Tyson might also create something completely unexpected, like a magical snack that fuels Percy's powers or a pair of boots that allow him to walk on water without getting wet. The possibilities are truly endless!