Board Thread:Destiny Forum/@comment-25926749-20150730153357/@comment-26388714-20150823162856

Perhaps, a subplot involving a captured Guardian on the Moon.

''A rookie Guardian on the Moon went dark just hours ago. We believe the Hive may be stealing his Light. End this foul ritual.''

Eris Morn guides you in this mission, and explains how her own Light was stolen, and what that glowing green orb with a rock in it is.

As you descend through the Hellmouth she also goes into a bit more detail on her Fireteam, as well as naming the currently unknown members.