An 11-year-old story detail from the Halo: Reach Limited Edition's journal has been confirmed in new marketing material for the upcoming Halo Infinite. Very little has been revealed about the plot of the sequel other than the fact that players will battle the Banished and its leader Escharum as Master Chief attempts to regain control of Zeta Halo and discover the truth behind Cortana and her rampancy in Halo 5: Guardians.
Halo Infinite had a very public delay last year after a gameplay reveal
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