Trident of Fish Command
Weapon · Uncommon · Attunement · SRD 5.2.1 p. 250
Weapon (Trident), Uncommon (Requires Attunement)
This magic weapon has 3 charges, and it regains 1d3 expended charges daily at dawn. While you carry it, you can expend 1 charge to cast Dominate Beast (save DC 15) from it on a Beast that has a Swim Speed.