NieR Collab
From GRAY RAVENS
Debuting in the Untold Naraka patch about one year into the game's lifespan, the NieR: Automata characters make up a potent Physical team. Due to their nature as collab characters, 2B, 9S, and A2 -- as well as their weapons -- are available for a limited time only. They can only be obtained during Untold Naraka or during their single rerun in one of the patches following that.