Druids from land and sea are drawn to the natural power water has that shapes plant and animal life. Many are aquatic seafaring races themselves such as Sea Elves or Tritons. Some are connected to freshwater biomes. Many of these druids often work with circle of the land druids in peace, as both do venerate similar ideals and gods. However some evil seafaring druids worship sharks or evils down in the deep sea such as krakens and ancient undead. Some Sahuagin druids might seek to conquer the land.

Seafaring druids are as diverse as land faring ones. Many aquatic druids seek to become circle of the moon druids, but many do choose the circle of the water. Some curious Sea Elves might even choose to become a circle of the land druid out of respect for the other side of nature, just as many land based druids can choose the circle of water.

Bonus Cantrip

When you choose this circle at 2nd level, you learn one additional druid cantrip of your choice. This cantrip doesn’t count against the number of druid cantrips you know.

Spells of the Misty Pool

Starting at 2nd level, you can manipulate some of the magic inherent in water to bolster your own magical strength. You gain the spell major image and one 1st level spell from any class list or any school. These spells are always prepared and don't count against the number of spells known.

You can cast each of these spells once per short rest without expending a spell slot. These spells cannot be cast using ordinary slots.

Circle Spells

Your mystical connection to the water infuses you with the ability to cast certain spells. At 3rd, 5th, 7th, and 9th level you gain access to circle spells connected to the watery biome where be. Choose between — shallow sea, open sea, deep sea, arctic sea, lake, river, or waterfall — and consult the associated list of spells.

(Search your chosen circle on DnD Beyond's homebrew page; search circle of the water (river), for example.

Once you gain access to a circle spell, you always have it prepared, and it doesn’t count against the number of spells you can prepare each day. If you gain access to a spell that doesn’t appear on the druid spell list, the spell is nonetheless a druid spell for you.

Shallow Sea

DRUID LEVEL	SPELLS
3rd	calm emotions, misty step
5th	gaseous form, hypnotic pattern
7th	confusion, greater invisibility
9th	scrying, wall of light

Open Sea

DRUID LEVEL	SPELLS
3rd	blur, wall of water
5th	tidal wave, water walk
7th	control water, watery sphere
9th	awaken, synaptic static

Deep Sea

DRUID LEVEL	SPELLS
3rd	darkness, silence
5th	animate dead, fear
7th	black tentacles, phantasmal killer
9th	dominate person, raise dead

Arctic Sea

DRUID LEVEL	SPELLS
3rd	hold person, invisibility
5th	dispel magic, elemental weapon
7th	death ward, ice storm
9th	cone of cold, hold monster

Lake

DRUID LEVEL	SPELLS
3rd	mirror image, prayer of healing
5th	blink, slow
7th	arcane eye, guardian of faith
9th	commune with nature, far step

River

DRUID LEVEL	SPELLS
3rd	detect thoughts, healing spirit
5th	haste, revivify
7th	control water, freedom of movement
9th	control winds, greater restoration

Waterfall

DRUID LEVEL	SPELLS
3rd	aid, levitate
5th	aura of vitality, clairvoyance
7th	dimension door, hallucinatory terrain
9th	conjure elemental, modify memory

Aquatic Explorer

Starting at 6th level, you gain the spell water breathing, and can cast it at will.

Strength of the Water Dragon

When you reach 10th level, you gain resistance to fire and cold damage as the blood of the great water dragon surges through you.

In addition, long rests restore two levels of exhaustion instead of one.

Druid of the Blue

When you reach 14th level, you gain a swim speed of 50 feet

In addition, you can use 2 uses of your wild shape to become a water elemental, following all the normal rules of wild shape.