Thalatta

Geography

Thalatta is a 25,000km wide orb of water collected from the ancient flood waters from Naaglok. Its spherical shape is maintained by a population of siren-like predators who influence the currents by 'swimming' in an intricate pattern. This forces multiple bands of water into a neat, and interlaced, alignment that forms a pattern that wraps around the core; reminiscent of a fist knot.

Ecosystem

Surface Layer

Roll for Rain	Effects	Roll for Waves	Height Effects
1 - 5	No Rain	1 - 10	10ft Swells On a roll between 1-2, succeed a DC 15 DEX save to grab a crew member as they fall over
6 - 10	Heavy Rain -1 all checks -4 Perception visibility reduced by half	11 - 15	20ft Swells On a roll between 5-9, (only after 10 hours), crew morale bonus is halved and requires a DC 15 CHA save to negate
11 - 20	Blinding Rain -2 all checks -6 Perception visibility reduced to ¼	16 - 20	30ft Swells On a roll between 18-20, all not tied down must make a DC 15 DEX or STR save or be thrown around

Ecosystem Cycles

Crisscrossing Currents

In essence, this globe is a series of rotating rings meticulously layered to create a compact structure that goes on several leagues deep without inflicting higher than normal pressure at the lower layers.

Potential crash victims must succeed on a DC 20 PER save. On a fail, must then succeed a DC 22 DEX save or take 3d6 bludgeoning damage from impacting the surface layer.
The following is the series of challenges a trapped ship has to go through in order to escape the global currents. Note that it takes damage every time it crosses between layers, so that even when backtracking, the ship would have to take damage every time. Two exceptions to this are when entering the empty center or leaving the first layer.

First Layer

Any medium or smaller vessel that fails its first DC 23 save to escape must succeed on a second DC 20 or be pulled into the torrent and held suspended (restrained) in its powerful currents, taking 1d8+5 damage every round on your turn with no saves allowed.
You may direct the whirlpool to eject any carried NPCs whenever you wish. If a vessel's length that is shorter than the vortex's width takes 6d6 damage and is grappled by the current. The ship makes a DC 25 WIS check. If the vessel is longer than the current's width, it takes only half damage and is not caught up by the vortex.

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Second Layer

Entering the boundary layer: Succeed a DC 20 PER check to notice the incoming layer and course correct. On a fail, succeed a DC 24 or take d8+4 damage and enter the second layer.
Striking the sides: Succeed a DC 15 PER check to notice the incoming layer and course correct.
On a fail, succeed a DC 20 or take d4+3 damage, followed by d8+12 bludgeoning damage from a rapid change in direction due to entering another stream.
On a success, take d4 damage and stay in your current stream.
Existing the boundary layer: Succeed a DC 22 PER check to notice the incoming layer and course correct. On a fail, succeed a DC 22 or take d8+5 damage and enter the third layer.

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Third Layer

Entering the boundary layer: Succeed a DC 15 PER check to notice the incoming layer and course correct. On a fail, succeed a DC 18 or take d8+5 damage and enter the third layer.
Striking the sides: Succeed a DC 10 PER check to notice the incoming layer and course correct.
On a fail, experience a rapid change in direction due to entering another stream and must succeed a DC 15 or

take 2d4+3 damage

followed by 2d12 bludgeoning

on a 1 are struck by 3d12 lightning damage
On a success, take 2d4 damage and stay in your current stream.
Existing the boundary layer: Succeed a DC 11 PER check to notice the incoming layer and course correct. On a fail, succeed a DC 11 or take d8+7 damage and enter the fourth layer.

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Fourth Layer

Entering the boundary layer: Succeed a DC 10 PER check to notice the incoming layer and course correct. On a fail, succeed a DC 10 or take d8+7 damage and enter the fourth layer.
Striking the sides: Succeed a DC 5 PER check to notice the incoming layer and course correct.
On a fail, experience a rapid change in direction due to entering another stream and must succeed a DC 10 or

take 3d4 damage

followed by 3d12 bludgeoning and 3d8 cold damage

on a 1 are struck by 3d12 lightning damage
On a success, take 3d4 damage and stay in your current stream.
Existing the boundary layer: Succeed a DC 11 PER check to notice the incoming layer and course correct. On a fail, succeed a DC 11 and enter the core.

Localized Phenomena

Tassa

A moon-like body spun off from Thalatta's waters, 5,000km wide, that orbits the larger source and habours a renege population of friendly meridians.

Theches

The water rings of Thalatta encircle an empty core, 6-7,000km wide. The currents surrounding its outer layer make it difficult for any non-meridian to escape.

Climate

Turbulence

The surface of the water world is in a perpetual state of motion. There are no solid masses to break up the waves causing frequent and intense storms on the surface, driven primarily by complex oceanic currents and circulation patterns.

DC	Description		Vessel Handling	Effects
10	Heavy Gale
15	Strong Storm		Scudding	-1 penalty to physical checks -5 penalty to handle the ship
20	Typical Hurricane		On Course	-2 penalty to physical checks
25	Overwhelming Hurricane		Improve Status/Hold	Push back 25ft and deal 2d10 + bludgeoning damage. To take half damage, make a DEX saving throw against a DC 10 + WIS, CHA or INT modifier + proficiency bonus One piece of major damage when the ship ends abreast of the waves

Fauna & Flora

Through a profound connection with the ocean's energy. Meridians possess remarkable abilities, harnessing the power of currents and tides to shape the very fabric of their underwater realm.

With streamlined features, they effortlessly navigate their artificial sea, embodying essence of marine elegance.

— Time Mage's admiration

History

Thalatta Flood

A long time ago, an ungodly amount of water flooded out of Rasatal and eventually collected together into Thalatta.

It is known from the meridians; that this torrent, and the meridians with it, were forcibly ejected from an entirely liquid realm called Naaglok.
Thalatta is their attempt to recreate home.

— Aubade Tren

Ecological Influence

For one thousand years in the distant past, this globular sphere was used to lay siege to the Nonantum route between the laplwyd capital and the Moirai burrows.
The end result of which was:

1. the drowning of the Everdark
2. the great species interchange
3. the mass bleeding of the ocean orb that reduced its current mass by 3

Tourism

Modifiers:

+2 per crew member

+4 per Officer

+5 for Captain

-5 for every major ship damage

DC 15 Climb: +2 for a PC (Falls if fail by 5)

DC 10 STR: +1 for a PC

See Disaster Table for further storm-derived rules

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Trapezus Conspiracy

Reputable cruise operators with experience around Trabzon, the orbitary path Tassa travels, sell vacation packages to adventurous travelers seeking off-the-beaten-path experiences.
Of course, they carried inherent risks. Passengers are responsible for their own comfort, safety precautions, and travel advisories before embarking on these journeys.

Cruises consult with Thessaly advisories, obtain appropriate travel insurance and prepare for unexpected situations during a typical 6-day voyage revolving around Thalatta.

Most are hoping to catch sight of the meridians' kolossa. And though rare, a passenger may be attacked by a meridian for their dignitas.

— travel representative

Under the Sea Flash Challenge Entry

This article is an entry to the unofficial Under the Sea Flash Challenge.

Alternative Name(s)

Spherical Sea

Misty Ocean

Type

Ocean

Location under

Lurker Threshold

Related Tradition (Primary)

• Death Dance

Inhabiting Species

• Meridians

Red glitterings, scattered like liquid stardust, remain a tantalizing secret.
The Meridians' intricate web of luminescent patterns only appear in the waters when large schools culminate; casting an enchanting glow that captivates all who witness it.

— Witnessing the kolossa phenomenon