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Arkiloth are the colossal living creatures on whose backs humanity survives in Bringer. Official English copy states that "Humanity can only survive upon the backs of colossal creatures known as Arkiloth", and the studio's announcement overview lists "colossal lifeforms" among the three forces that shape the adventure, alongside clashes between civilizations and an uncertain fate.

Because Thalassa leaves the land beneath it fleeting, the Arkiloth are not transport in the ordinary sense. They are where people live. The migration that the premise describes is the Arkiloth moving, with human settlement riding on top of them.

Name Across Languages

Arkiloth is the second of the two world terms the studio glosses inline in its own prose. The traditional Chinese page writes 名為「隆舶（Arkiloth）」的巨型生物, and the Korean page writes 아르킬로스(Arkiloth).

Two other spellings appear in the wild and neither is official. "Longbo" is simply the Mandarin pinyin of 隆舶 and shows up in older Chinese material and in write ups drawn from it. "Yungbak" is a Korean language romanization of the same characters. Both refer to the Arkiloth and neither is a separate creature. This wiki uses Arkiloth.

Ancient Beasts

Official material also uses a descriptive category for these creatures, separate from their name. The English site closes its description by inviting players to "begin a legendary tale of coexistence with ancient beasts", and the reveal trailer narration says "Upon this Thalassa, where we coexist with Ancient Beasts." The Chinese form is 巨獸 in traditional script and 巨兽 in simplified, the Japanese is 巨獣 and the Korean is 고대의 거수. These are descriptive words for the same kind of creature, not a second proper noun, and no page should treat 巨獸 as a name.

The theme attached to them is coexistence, written 共生 in both Chinese and Japanese. The relationship is framed as living alongside the creatures rather than taming or fighting them, although official material never rules out conflict with them either.

Bio-Cruisers

Two official English channels tell the player to command something called Bio-Cruisers. The official community server description reads "Command your Bio-Cruisers, explore the tides of Thalassa, uncover hidden secrets, and forge your own destiny", and the official video channel description says "you will command a variety of Bio-Cruisers". Both use the same capitalised, hyphenated spelling and the same verb, so the term is real and is player facing.

Beyond those two sentences the record is empty. Bio-Cruisers are never defined, never explained, and never shown. The term appears on no Chinese, Japanese or Korean surface and has no counterpart in the glossary, which is unusual for a game whose other two world terms are glossed inline in four languages. Crucially, no official source states any relationship between Bio-Cruisers and Arkiloth. The resemblance between "command a variety of Bio-Cruisers" and a world where people ride colossal creatures is suggestive, but the connection is not stated and this wiki does not assert it. See Combat for the term in its gameplay context.

Other Creature Terminology

A separate creature term, 海巡兽, appears in simplified Chinese Mainland material from 2025. It is never defined, it has no English form anywhere in the record, and nothing connects it to 隆舶. It is recorded here and in the glossary only so that readers meeting it in Chinese material know it is a real term from this game and not a mistranslation.

What Is Not Known

As of 13 September 2026, official material has not stated:

• The name of any individual Arkiloth.

• How many exist, or whether each carries one community or many.

• Whether they are animals, constructs, or something else.

• Whether the player can direct, board, defend or fight one.

• What happens to an Arkiloth that falls behind.

• Any confirmed on screen depiction of one. No official video identifies an Arkiloth by name.