'Greetings. I am Torfi of the Iron Garrison, tasked with the reclamation of Sejer-tharakh. Within, there lies a vast store of lumber which we could readily use to begin repairs across Khazad-dum.
'Unfortunately, we cannot claim this storehouse until the intruders within have been dealt with. Perhaps with your aid, we could strike terror into these intruders and drive them out.
'I am certain that these intruders have a leader, someone -- or something -- that holds sway over them. Quickly, enter Sejer-tharakh and dispatch the foe who commands the rest of those within.'
With a foothold established in the Twenty-first Hall, the Iron Garrison has begun the reclamation of the forgotten stockhouses, libraries, and mines of Moria. The lumber warehouse of Sejer-tharakh is one such location.
Defeat leader of the intruders within Sejer-tharakh
The entrance to Sejer-tharakh lies within Mezer-serej.
Torfi has asked you to defeat the leader of the intruders within Sejer-tharakh.
Talk to Torfi at Mezer-serej
Torfi is at Mezer-serej.
With the defeat of their leader, the intruders within Sejer-tharakh have had their morale weakened. You should return to Torfi and tell him of your victory.
The Iron Garrison has created a diversion, drawing the bulk of the intruders from the depths of Sejer-tharakh. They are permitting you access for one hour, during which time you may enter and exit Sejer-tharakh freely to complete the tasks bestown upon you.
However, after the hour has passed, the Iron Garrison will bar access until they can once again muster an offense to draw the enemy from Sejer-tharakh.
Also note, that all mobs inside these instances are random...
You could have a dungeon full of Orcs, or Goblins, or Cave-claws, or Gredbyg.