Trident of Fish Command
Weapon,
Uncommon
(requires attunement; cost 500 gp)
Crafting Components
This weapon has 3 charges. While carrying the trident, you can use an action to expend 1 charge and cast dominate beast (save DC 15) on a beast with an innate swimming speed. At dawn each day the trident regains 1d3 expended charges.
Source