The fourth Document fragment is an item used to solve the last puzzle in the Rune Memories quest. It is one of five document fragments. Despite the destroy option message, it is impossible to obtain any of these after the quest.
Transcript
The following text is transcluded from Transcript:Document fragment (4/5).
...the Green Apprentice stands at the left hand of the Grey Master, and at the right hand of the Blue Master...
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 Rune Mysteries (historical) | ||||||||
