Maybe the secrets to the Vault of Glass are hidden in the grimoire cards on bungie's site that nobody reads 0-o 😳
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I have a theory...(everyone does) but I am wondering if you beat atheon without any washes then the door may stay open (the one you come through). Since the raid does not automatically send you back to orbit it leaves me to believe there is more to do. Can you go back outside to the jumping puzzle and see if the warp gate in the distance is now activated.