This is an requirement for completing the Lunar Rover Badge, which is required for the Harbinger Seal.
After completing a bunch of Altars of Sorrows and receiving the same reward every singel time (Shotgun), im wondering if its still possible to receive the shell or is it bugged or maybe just very rare drop?!?!
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Heyo! It’s a rare drop. You are guaranteed to get it after your 40th clear, however. As for the blasphemer, Bungie is aware of this issue and are actively investigating: https://www.bungie.net/en/Forums/Post/257964123?sort=0&page=0