It’s time to reclaim what was lost. Fight for the grace of the Mantle in Operation: Forerunner, live now through May 6.

Once the galaxy’s self-appointed caretakers, the Forerunners have left behind many secrets in the form of sacred rings, colossal installations, mysterious artifacts—and devastating military technology.

The latest free 20-tier Operation Pass offers a chance to reclaim the Prefect armor from the annals of history. Reverse-engineered from the combat skin of the Forerunner Prefect class, this fan-favorite Halo 4 armor set has been adapted and reforged for a new chapter in Spartan excellence.

Complete all 20 tiers to prove yourself worthy of the title. May your foes tremble before you!