Echo in the Lightless Deep: What It Is, Price and Release Date

Echo in the Lightless Deep is listed on Steam as released October 23, 2026 at $8.49, developed by CelestialArk.

VERIFIED Source: Steam store page (appid 5293100), checked 2026-10-25

The dive runs from the surface through five zones to the seafloor 1,050 meters below, with a giant holding each of the five depths at 150, 320, 500, 800 and 1,050 meters.

VERIFIED Source: Steam store page (appid 5293100), checked 2026-10-25

Level-ups offer a three-card pick from 59 mutations in three families, and twelve fusion recipes turn two mutations into an evolved one.

VERIFIED Source: Steam store page (appid 5293100), checked 2026-10-25

What the game is

Echo in the Lightless Deep is a deep-sea survivor roguelite where you guide a small light core from the surface down through five zones of a sunless ocean.

Brightness is the heart of the game: it sets how far you can see, how far your symbionts can strike and how far away a monster notices you.

Collecting motes and picking light-side mutations makes the light grow, and so does everything that comes to meet it, while going dim keeps you safer.

The store page describes the whole trade-off as what every dive is made of, with combat running itself while you steer, dodge and time three skills.

Symbionts and the three skills

Symbionts orbit the core and tear into whatever comes close, and rare ones met in the dark, such as a lantern jellyfish or a blind cleaner shrimp, join you if you drift near.

Each symbiont has its own job, from lighting the way to soaking hits or straining motes from the water, and they have loyalty meters that make them leave for a while if run down.

Lights-Out dims to near-black: far fewer monsters appear, your damage halves, dark energy builds faster and the first hit on anything that has not spotted you deals 2.5 times damage.

Echo Pulse spends 40% of your dark energy to send a sonar ring that marks everything for four seconds and triple damage, and Light Devourer needs a full bar to give symbionts 2.5 times damage for twelve seconds at the cost of permanent dimming.

Builds, bosses and who it is for

The five giants are earlier descenders warped by their own obsessions into the largest predators in this sea, and each one leaves a relic behind (BOUNDED: official Steam description, checked 2026-10-25).

Drop a giant's health past a threshold and it escalates into a second, then a third phase with new attacks and a rage tempo, and hunters' projectiles get faster all the way down (BOUNDED: official Steam description, checked 2026-10-25).

Three build paths, Lumen Hunter, Abyss Stalker and Devourer, come out of the mutation families, and the end of one of those paths hides the true ending.

At the bottom you choose whether to return to the light or stay dark.