The war against the great enemy Sauron is going badly: his forces have captured the city of Osgiliath, and during an assault on Minas Tirith, capital of Gondor, the enemy damaged the mithril lock on the city's great gates, leaving them unable to withstand the next assault.

Resistance leaders Gandalf, Aragorn, Boromir, Gimli, and Legolas meet in the high tower of Minas Tirith and agree that the lock must be repaired, but without mithril the task is impossible, and the only source of the metal is the dangerous underground realm of Moria. Further, the dwarves protecting Gondor's northern flank are leaderless and dispirited, and may soon surrender to Sauron.

The group decides that the only solution to both problems is to send an immediate expedition to Moria with two goals: to retrieve the precious mithril needed to repair the gates of Minas Tirith, and to summon the legendary dwarf leader Durin the Deathless who supposedly sleeps somewhere in the caverns.

You, Boromir, Gimli, and Legolas agree to undertake the mission and Gandalf summons Great Eagles to carry you swiftly to the entrance.

Details at Eamon Wiki