Trident of Fish Command

From Dungeon Master's Guide, page 209. Found on Magic Item Table F.

Description
''Weapon (trident), uncommon (requires attunement). 4 lbs.''

This trident is a magic weapon. It has 3 charges. While you carry it, you can use an action and expend 1 charge to cast Dominate Beast (save DC 15) from it on a beast that has an innate swimming speed. The trident regains 1d3 expended charges daily at dawn.