"Black Arms" refers to a fictional organization in the Sonic the Hedgehog video game series. This group is known for its mercenary activities and often serves as antagonists in various storylines. They are typically depicted as a shadowy group involved in illegal operations, including weapon trafficking and espionage. The organization is often associated with characters like Shadow the Hedgehog, who has a complex relationship with them. While Black Arms is primarily known for their villainous roles, they also explore themes of loyalty and betrayal within their narratives, adding depth to the overall storyline of the Sonic franchise.