You have given Gandalf the glass shard you found locked in Khîl's home, and the Wizard believes it may prove crucial to revealing the secret writing in the Black Book of Mordor.
'There is a moving radiance held within this glass, ${PLAYER}, and it reminds me of something: the rotating beacon atop Barad Cúron, Tower of the Crescent Moon, in Minas Morgul. Is this a shard of glass from the beacon in the tower's topmost chamber?
'You have seen moon-letters before, and so have I. Can it be that Vóin wrote these secret words in the light of that beacon, knowing they could only be revealed by the same light? But what did he seek to hide? Did he record the location of the weapon sought by Gothmog?
'We must read the secret writing in the Black Book, ${PLAYER}. Let me know if you are ready to do so.'
Gandalf is inside the Beorninghús, eager to decipher the secret writing in the Black Book of Mordor.