Halo Infinite skulls

Halo Infinite are game modifiers featured in Halo Infinite with the appearance of a human skull.

Bandana
Found in the Silent Auditorium. To unlock the door to the room containing this skull, no Sentinels can be killed before claiming the skull. The room itself can be found near the end of the level, after activating a light bridge. Cross the bridge, and instead of heading left towards your objective, go straight ahead and through the door to find the skull.