Once held in the dungeon of White Plume Mountain, this trident is an exquisite, yet dark weapon, engraved with images of rogue waves, storms, and sea monsters. Although you must worship a god of darker things to attune to this weapon, Tide happily accepts new converts.

You gain a +3 bonus to attack and damage rolls made with this magic weapon. If you score a critical hit with it, the target takes extra necrotic damage equal to half its hit point maximum.

The weapon also functions as a trident of fish command and a weapon of warning. It can confer the benefit of a cap of water breathing while you hold it, and you can use it as a cube of force by choosing the effect, instead of pressing cube sides to select it.

While wielding it, you can turn invisible as an action, by having it invoke the power of the dark depths beneath the ocean to conceal you. Anything you are wearing or carrying is invisible with you. You remain invisible until Tide is sheathed, until you attack or cast a spell, or until you use a bonus action to become visible again.

After making a ranged attack with its thrown property, you can choose to have it fly back to your hand with a flying and swimming speed of 120ft, same goes for if you are ever separated from it in any way.

While wielding it, you gain a swimming speed of 30ft.

Sentience

Tide is a sentient weapon of chaotic neutral alignment, with an Intelligence of 16, a Wisdom of 12, and a Charisma of 20. It has hearing and darkvision out to a range of 120 feet.

The weapon communicates telepathically with its wielder and can speak, read, and understand Aquan and Abyssal. It can also speak with aquatic animals as if using a speak with animals spell, using telepathy to involve its wielder in the conversation.

Personality

When it grows restless, Tide has a habit of humming tunes that vary from sea chanteys to sacred hymns of Tal-Thillash.

Tide zealously desires to convert mortals to the worship of one or more dark gods, or else to consign the faithless to death. Conflict arises if the wielder fails to further the weapon’s objectives in the world.

The trident used to be another, Wave, before it was found at the depths of the ocean by Tal-Thillash, goddess of darkness and the deep sea. She took it, and changed it, its opinions and purpose, but not its personality. She blessed it with her power, which changed its previous purpose so much that it needed a new name. She called it Tide, and hurled it up with all her might to make it fly to its previous owner without issue, which it did.

Proficiency with a Trident allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Bonus: Magic, Advantage: Initiative, Set: Speed (Swimming), Creature that Worships a God of Darker Things, Damage, Buff, Utility, Combat, Sentient, Thrown, Versatile, Topple