What song is this?

Remaking the Legend: Halo 2 Anniversary (Documentary) on Twitch

Starting at about the 49:42 mark in the documentary, I hear some very cool music. Does anyone know where this is from or if it is a new piece? Would be much appreciated.

Super stoked to play The Master Chief Collection and experience Halo all over again with the Halo community from a new perspective!

Its ‘Breaking The Covenant’, the new theme in H2A which replaces Blow Me Away, in High Charity. In the Mausoleum room.

Whats the song at 55:00 is my question