In the days when the dwarves of Durin’s line dwelled in the halls of Khazad-dûm, they had built a great network of mirrors which allowed the light of the sun to burn in their subterranean chambers. Many mirrors remain throughout Moria, but the halls of Lumul-nar were the hub where the sunlight was first reflected.

Like moths drawn to a fire, bats and evil merrevail have occupied the Mirror Halls of Lumul-nar. The merrevail seek to forever extinguish the light of the dwarf-mirrors and bring darkness once more to Moria.

Lumul-nar is a three-player instance in The Lord of the Rings Online: Mines of Moria, featuring two bosses, a hard challenge mode, and a radiance armour set piece.  It also features a puzzle-based game mechanic.

Read more information about this instance

With latest LOTRO Book 8 Crafting Enhancements, Turbine has released new six screenshots for the next free content update of the upcoming Volume II: Book 8: Scourge of Khazad-dum. These screenshots illustrate the new crafting halls, which will be added with Book 8 in June.

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After the latest screenshots of Water Wheels, Book 8:  Scourge of Khazad-dum, we are happy to offer you a sneak peek look at the newest Book 8 Bosses and new instances including the Hall of Mirrors instance in ZirakZaigil with rewards and Dar Narbugud (12-man raid).

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Sources:
massively.com
forums.lotro.com