What Halo story arc did 343 Industries oversee from Halo 4 to Halo Infinite?

The Halo story arc overseen by 343 Industries from Halo 4 through Halo Infinite is the Reclaimer Saga.

The saga began with Halo 4, released on November 6, 2012, and follows the continuing story of Master Chief and Cortana after the original trilogy. Halo 4 introduced the Forerunner world Requiem and renewed attention on the ancient civilization whose technology shaped the series' central mysteries.

The arc continued with Halo 5: Guardians in 2015 and concluded, in its original planned trilogy structure, with Halo Infinite in 2021. Across these games, the narrative explored humanity's relationship to Forerunner technology, Cortana's transformation, and the emergence of threats such as the Banished.

The Forerunner Trilogy is a separate name associated with Greg Bear's Halo novels, not the mainline game arc. “Covenant Saga” and “Created Conflict” are not the canonical titles for this sequence.