There are three doors that open in today's daily mission when you hold your ghost to them in the room where you encounter all the cursed thralls.
Don't know if this could be linked to anything, tried opening them in all different orders, with three people at each door but couldn't see if it started something. Could potentially be something hidden by Bungie.
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There is a ultra knight that spawns in the hallway after you kill crotas soul. Its shields are super strong and can take every shot of sleeper simulant. Any thoughts?