ARCUS, an abbreviation for All-Round Communication & Unison System, newly-made fifth-generation battle orbment developed by the Epstein Foundation in collaboration with the Reinford Group. Each unit has a built-in communications functionality. It's defining feature is the ability to link up with a partner to greatly enhance combat ability.
ARCUS II
Trails of Cold Steel III introduces the successor to the ARCUS, the ARCUS II. Additionally of being able to perform all the functions of it's predeccessor, it also allows usage of Brave Orders and setting of sub Master Quartz as well as taking photos, sending messages and installing apps such as Round of Seven and Pom! Pom! Party!.
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