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AdjutantReflex's second bungie.net avatar.
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N'chala's rock painting.
The Forerunner Email was sent to all recipients of the Xbox Flash newsletter and seems tied to AdjutantReflex. It consists of a cryptic poem alongside an image depicting a Forerunner wall with a symbol on it, the same symbol used as an avatar by AdjutantReflex and the same observed by N'chala as Forerunner machines built the object speculated to be the Ark.