If you read the Queen's ransom Grimoire Card The Queen tells her brother to send Crows to Mercury and to the tower to meet their new "Friend". (Presumably Xur) Does this mean that there's something on Mercury that the Guardians will have to look in too? It is said that no one has been to Mercury since the Vex turned it into a machine world. What's on Mercury that the queen is interested in and what is Xur's role in all of this? feel free to comment down below and share you thoughts.
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But It's just a theory, "A Redacted Theory"