Terra's Dawn mod for Age of Empires III: The Asian Dynasties

Arknights takes place in a dystopian, somewhat grimdark world of Terra which is almost similar to our own aside of the presence of humans with animalistic traits and magic-like powers (Arts), and is devastated by Catastrophes forcing its inhabitants to adopt a nomadic life through nomadic cities as well as the pandemic of Oripathy, a terminal disease caused from exposure to Originium, a crystalline mineral left behind after Catastrophes used in many applications including Arts.

The game is told from the perspective of Rhodes Island, a paramilitary medical organization sought to provide treatment and finding cure to Oripathy, through an enigmatic, amnesiac doctor recently awakened from a long cryogenic sleep, and follows their conflict with the Reunion, a violent non-state actor intending to punish the Terran society for their mistreatments towards the Infected – individuals with Oripathy.

Terra is ravaged by Catastrophes; various cataclysmic natural disasters that forces much of Terra's inhabitants to adopt a nomadic way of life through nomadic cities instead of a sedentary one, with few exceptions. A crystalline substance known as Originium is left behind at the site of Catastrophes and are widely used as a source of energy and the catalyst for magic-like Originium Arts, but at the same time it is capable of causing a terminal disease known as Oripathy from direct or prolonged exposure towards Originium.

Terra is predominantly inhabited by various "human" races, both humanoid and anthropomorphic.

The technology level of Terra is almost similar to that of our own world, but noticeably more advanced though not too far-fetched. In regards to warfare, however, medieval weaponry (e.g. swords, spears, shields, bows, crossbows, etc.) are used most of the time; firearms do exist, but they use Originium Arts instead of gunpowder as the operating mechanism and their projectiles are made of Originium, thus making firearms a rare sight with handguns being more common than long guns, the latter of which are exclusively used by the Sankta.

As with our world, Terra is divided into many nation-states, with most of them are parallel to those in our world，and Terra's flora and fauna are different to that of our world's.