Light's Hammer is the entrance hall of Icecrown Citadel, held by the Ashen Verdict. Highlords Tirion Fordring of the Argent Crusade and Darion Mograine of the Ebon Blade, attired in their class' Tier 10 armor, can be found in here, as well as quartermasters and other vendors for the Ashen Verdict. All of the Tier 10 vendors are also located here.
Players enter from the north and head south toward Lord Marrowgar and Lady Deathwhisper. The Damned make incursions from the south and are dealt with by guard NPCs.