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· Over 40 races appear in Arknights, but they are broadly categorized into five: Ancient Humans, Sarkaz, Ancients, Sui, and Colossi.
· This video will explain the history, derivative races, and characteristics of these five races in detail.
· Please be aware that this video contains spoilers from the Japanese version of Arknights.

· Ancient Humans were active until about 13,000 years ago, developing advanced civilizations with interstellar travel and terraforming capabilities.
· They were already destroyed by the 'Fate of the End,' leaving various relics and Originium on Terra.
· Originium stores information, influences the evolution of living beings, and was deeply involved in the birth of the Sarkaz and Ancients.
· The Doctor and Pretis were leaders of a plan using Originium, sleeping for 13,000 years in sarcophagi and now revived.
· Other Ancient Humans died when the sarcophagi's energy was depleted.
· Although important to the Arknights story, they rarely appear as they are already extinct.

· Approximately 13,000 years ago, the Originium buried by Ancient Humans on Terra caused disasters and self-replicated.
· The indigenous people of Terra, the 'Pikaz,' were most affected, transforming into human-like forms under Originium's influence.
· It is presumed that human genetic information was mixed with the Pikaz because human information was stored in Originium.
· The name 'Sarkaz' was later given by the Ancients; Sarkaz are essentially Pikaz.
· Their homeland was called 'Kazdel,' and originally all of Terra belonged to the Sarkaz, but they lost their home due to the Ancients' invasion.
· During the era when Sarkaz flourished, there were over 100 sub-races, but most have now disappeared.
· Sub-races like the Central Emperor and Oni exist, and Class Dreen is also a member of the Sarkaz.
· Sancta are a race of Sarkaz mutated by the influence of a machine called PCS.

· Approximately 13,000 years ago, Terra and Taro2 were connected by a 'Front Gate,' allowing passage between them.
· Later, animals crossed from Taro2 to Terra, and these animals, under the influence of Originium, became humans with animal characteristics as they are today.
· They continued communal living in Terra's harsh environment, gradually forming hierarchical relationships.
· As some powerful races came to dominate the majority, the ruling class was distinguished as 'Nobles,' and the majority as 'Ancients.'
· Approximately 10,000 years ago, the Nobles and Ancients first encountered the Sarkaz, an event called the 'Descent.'
· Subsequently, they waged war against the Sarkaz for about 1,000 years, leading to the destruction of the first Kazdel 9,000 years ago.
· The Ancients began calling the Sarkaz 'Sarkaz' or 'Demons,' which created deep resentment between the Sarkaz and other races.

· The Sui, like the Ancients, originated from animals that came to Terra from Taro2.
· Under the influence of Originium, they took on human-like forms, but it is presumed that the Sui died in disasters and became 'Stigmata.'
· The Sui are beings formed by the collective spirits of deceased animals.
· Various Sui exist, such as the Heavenly, Sheep, and Wolf, and they interact with the people of Terra according to their instincts.
· As they are already Stigmata, they fundamentally do not die.
· While generally appearing animal-like, some Sui assume human forms under the influence of Originium.
· The Black Serpent of Fire, the Troupe Leader, and Unicorn are also presumed to be Sui.
· Although sometimes referred to as 'Luminaries,' they seem to have no concept of death itself.
· Some Sui, like Holyna and Christine, act alongside specific humans, while others, like Emperor, establish record companies, showing their diversity.
· Sui can create fragments separated from their main body, called 'Zhu.'
· These fragments appear animal-like and act in groups; common animals like Moose's pets are thought to be these 'Zhu.'

· Colossi are originally divine beings existing on Terra.
· According to Kal'tsit, in the past, they could even change the fate of stars with their transcendent power.
· Now, their power has weakened, and they hide in the shadows of history.
· They are described as magnificent beings composed of matter beyond the laws of nature, capable of reshaping environments to nurture life.
· The bodies of Colossi are, as their name suggests, enormous, and life often thrives within them. Protecting life can be said to be the role of the Colossi.
· The most famous Colossi are the proxies of 'Sa,' where a Colossus named 'Sa' is divided into 12 parts, each with a different personality.
· 'Sa' is a Colossus but mimicked a human form and cooperated with humans in the past to subjugate other Colossi.
· There are also human-shaped Colossi, such as Yera, the Colossus of Kjerag.
· 'Elves' are beings derived from Colossi.
· Elves are described as 'manifestations' of Colossi; while not Colossi themselves, their connection is certain.
· As Myrdys's story progresses, the mystery of the Elves is expected to be revealed.