Wondrous Item

Legendary

Voice of the Deep

While carrying the Shell of the Leviathan, your voice can be heard clearly over crashing waves, roaring surf, heavy rain, and battlefield chaos out to 300 feet. Aquatic creatures can always hear and understand the intent behind your voice, even if they do not understand your language.  

Leviathan’s Breath

You can breathe underwater and gain a swim speed of 50 feet. In addition, you can withstand the crushing pressure of the deep and suffer no penalties from fighting underwater.  

Call the Current

As an action, you may blow the shell and command the waters to answer. Choose a point you can see within 120 feet that is touching water, soaked ground, mud, or surf. A violent surge erupts in a 20-foot radius. Creatures in the area must make a DC 18 Strength saving throw or take 6d8 bludgeoning damage and be knocked prone. On a success, they take half damage and are not knocked prone. You can use this property three times per long rest.  

Summons of the Sea

As an action, you may sound the shell to call forth oceanic life. This functions as conjure animals or conjure elemental, but only to summon beasts or elementals tied to the sea, coast, reef, river mouth, or deep ocean. Creatures summoned this way gain temporary hit points equal to your proficiency bonus at the start of each of their turns while within 60 feet of you. Once you use this property to cast conjure elemental, you cannot do so again until you finish a long rest.  

Warning of the Drowned

When you blow the shell, all allied creatures of your choice within 60 feet immediately know the direction of the nearest water source, exit route, shoreline, or safest passage through a flooded or coastal environment. In addition, allies have advantage on saving throws against being surprised, swept away, knocked prone, or moved against their will until the start of your next turn.  

Echoes of the Leviathan

The shell remembers ancient sea life. While attuned to it, you may communicate with aquatic beasts, monstrosities of the deep, and creatures with a swim speed as though under the effect of speak with animals, though this communication is instinctive and emotional rather than verbal.  

Enhanced Properties (Post-Attunement)

When attuned, the Shell of the Leviathan awakens as a relic of ancient command, allowing its bearer to call and direct the life of the sea as Mari once did.  

Chorus of the Abyss

Whenever you cast a spell or use an ability that summons creatures, you may summon one additional creature if the effect allows multiple summons, or grant one summoned creature maximum hit points if the effect summons only one.  

Tidebound Legion

Aquatic allies and summoned creatures within 60 feet of you gain:  

• advantage on attack rolls

• advantage on Strength and Constitution saving throws

• and an additional 2d8 cold damage on weapon attacks once per turn

 

Sea-Heart Resonance

Once on each of your turns, when you deal damage to a creature while it is touching water, soaked earth, or standing in magical liquid, you may deal an additional 4d8 thunder damage as the shell’s call ruptures through its body like an echo beneath the sea.  

Beckon the Great Below

As a 10-minute ritual, you may use the shell to call a massive sea creature from the surrounding waters. This does not guarantee obedience from legendary beings, but any non-hostile or neutral aquatic creature of great size is compelled to approach if it is within 10 miles and capable of hearing the call through the sea.  

Siren of Safe Passage

Friendly ships, mounts, and creatures traveling with you cannot become lost at sea by nonmagical means. Waters around you remain favorable for travel unless actively opposed by divine or artifact-level interference.  

Special Ability: Call of the World-Whale

  Once per long rest, you may raise the Shell of the Leviathan and sound a call so ancient that the sea itself answers in full. For 1 minute, the battlefield or surrounding waters become an extension of Mari’s living dominion.   For the duration:  

• A 60-foot-radius aura centered on you fills with surging water, echoing whale-song, and spectral shapes of colossal leviathans beneath the surface.

• Hostile creatures of your choice in the area treat it as magical difficult terrain.

• At the start of each of your turns, choose up to three hostile creatures in the area. Each must succeed on a DC 20 Wisdom saving throw or become frightened of you until the start of your next turn as they glimpse the vast forms moving below them.

• As a bonus action, you may direct a phantom leviathan to strike a point you can see within 120 feet. All creatures in a 25-foot radius must make a DC 20 Strength saving throw, taking 8d10 bludgeoning damage plus 4d10 cold damage on a failed save, or half as much on a success. Creatures that fail are also knocked prone.

• Friendly summoned creatures and aquatic allies in the area gain temporary hit points equal to your Wisdom modifier at the start of their turns and may use their reactions to move up to half their speed without provoking opportunity attacks.

• If you are in or near a natural body of water, you may instead use your bonus action to summon one Leviathan Echo, a Huge spectral beast of water and sound that obeys your commands and lasts until the effect ends.

  When the ability ends, the spectral shapes fade, the waters settle, and the last note of the shell lingers in the air like a mournful hymn.

The Shell of the Leviathan is an immense spiral conch carved from the remains of a primordial sea-beast that once swam through the deepest reaches of Moanakai. Its surface is smooth as polished ivory, but veined with streaks of deep blue, black pearl, and sea-green shimmer that move like living currents beneath its surface. When held to the ear, it does not echo with hollow wind, but with the roar of distant tides, whale-song, and the groaning call of ancient things beneath the ocean floor. To sound the shell is to make a declaration to the sea itself. The waters listen. The deep answers. Schools turn, currents shift, beasts rise, and the very coast seems to brace for what comes next. This relic embodies Mari as the voice of the ocean — not its rage, not its depth, but its call. It is the artifact of summoning, command, warning, and ancient remembrance, a sacred instrument through which the sea announces its will.