Gothmog gave you a broken key as he died, but you do not know what it might have unlocked when whole. Unless your guess is wrong, it seems as if Gothmog himself did not know.
'I see the matter of the broken key has captured your interest, as it has mine. I have studied it closely, but that examination revealed no distinguishing marks upon its surface, and no clue to its origin. The top of the key appears to have been broken off, but several teeth remain. Not enough to match the key with a particular lock, however, and unlikely to open it should we chance upon the correct one. Pity.
'I will give it back to you, with the hope that you may find someone who knows about this key, or others like it.'
Gandalf leans on his staff and looks away over the encampment.
'I have been thinking about Gothmog's words. He said he was given this key by a Morgul-slave, and it would unlock a weapon that could not be overcome? I cannot imagine what this weapon might be, but we must not let it fall into the hands of evil. And there is another thing, ${PLAYER}. I get the sense that Gothmog himself did not know what this key might unlock. If he knew the location of such a weapon, would he not claim it at once? But he told you he searched in vain.
'There is something peculiar about all this. Good luck, friend.'
You must find someone who knows what the broken key might once have unlocked. But who could hold that secret?
Is it possible that Khîl Tale-spinner might know something about the broken key given to you by Gothmog?
The metalworkers are by the forges on the lower level of Járnfast.
The metalworker needs some time to fashion a new key using the mould provided by Khîl Tale-spinner.
The metalworker is by the forges on the lower level of Járnfast. He should have finished forging the key by now.
Khîl Tale-spinner has returned to the hidden chamber built by his thrice-great grandfather Vóin.
Khîl told you about a tiny locked box that he thought his mother used to store jewels, but perhaps it is far older than that...
He has placed it on the table in the hidden chamber, and waits for you to try the newly-forged key in its lock.
Khîl Tale-spinner is in the hidden chamber built by his thrice-great grandfather Vóin.
Gandalf intended to travel north with the casket containing the bones of Isildur, and should have arrived at the Beorninghús by now. You should bring him the glass shard you found within the tiny locked box from Khîl's home.