Source: The Book of Many Things

Weapon (trident), very rare (requires attunement)

You gain a +2 bonus to attack and damage rolls made with this magic trident. You also have advantage on attack rolls made with this weapon while underwater.

This trident has 3 charges. You can expend 1 charge to cast Control Water (save DC 15) from the trident or 3 charges to cast Tsunami (save DC 15) from it instead. The trident regains 1d3 expended charges daily at dawn.