Urpearl

This gleaming substance is harvested by sea elves deep beneath the ocean waves. Urpearl is as hard as iron, but it has neutral buoyancy -- making it an ideal material for underwater tools and weapons.

Urpearl Weapon (Common): This weapon has been designed for aquatic use (see Underwater Combat).

Urpearl Armor (Uncommon): No Fighting test can have advantage against you; so long as you are wearing this armor, you are immersed in water, and you are not incapacitated.