A city on the planet Hima and home to the Mercantile, a courier exchange where Michael Burnham and Cleveland Booker ran into trouble shortly after her arrival in the 32nd century.
Requiem is a settlement on Hima, the world on which Michael Burnham lands in 3188 in the Discovery episode That Hope Is You, Part 1. Its main feature is the Mercantile, a busy exchange run by Orions and Andorians where independent couriers take jobs and trade for scarce dilithium.
Burnham goes there with the courier Cleveland Booker, hoping to barter her 23rd-century equipment for information and a way to contact her ship. Book instead betrays her to gain access to the vault and recover his cargo.
Under a truth-loosening drug Burnham reveals that Book's cargo was stolen, and the two have to shoot their way out together, hopping across Hima with personal transporters while the Mercantile's enforcers give chase.