If we know the demons, and we do because we've studied them extensively,
they're fast at work repairing any damage that has been done to their
precious transporter.
So, if you want a chance at another darkrune, take our banishing crystal
back out there and eliminate more demons. Besides, you want to help us to
lessen the threat that the demons pose, yes?
We said "chance" because the process we use yields mixed results. You might
get a darkrune, or you might get something else entirely.
Progress
A seasoned pro such as yourself shouldn't be having any difficulty banishing
demons. You're not having any difficulties, right, <race>?
Completion
We wish the process of creating a darkrune was foolproof, <name>. Alas, it
is not. Please, take this bag and look in it to see what we've wrought
today. We couldn't bear to look ourselves.
Remember, if you get a darkrune, take it to Gahk to exchange for a
crystalforged darkrune. Then you'll be able to once more bring down
Shartuul's transporter.
Oh, and <name>, don't forget to come by again tomorrow and pickup the
banishing crystal. There are always more demons to be banished.