Here is a quote from the Fall of Myth Drannor Sourcebook concerning the Namless One (Khelben Arunsun)
Silversgate
The battle at Silversgate is one of the most storied and heroic tales of the entire Weeping War, as one who was denied his name by Myth Drannor apparently gave his life in its cause. In short, the Army of Darkness was driven east, and its northern and southern factions merged and punched through the elf defenders on the western front as they passed, allowing them a second charge on Myth Drannor. The bulk of this battle occurred among the streets of the old city Cormanthor, and its climax centered on the Silversgate, the magical gate to Silverymoon Pass and a link to the sister cities of Ascalhorn and Silverymoon.
While the military fought bravely on all fronts, this battle was primarily one of magic and thus spearheaded by Spell-Major Josidiah Starym, Elminster, Symrustar Auglamyr, and the Nameless Chosen. With many elf forces exhasted from the previous battles,only the cavlry and two-thrids of the available Akh'faer forces were in the city for its defense until the arrival after battle's start of the Wing cavalry, some gold, silver, and electrum dragon allies, and the Three Chosen.
The spellcasters and military worked together to isolate and destroy the reduced and tired battalions (the Cruelty, the Colossus, the Grievous, Battalion Arcane) of the Army of Darkness. In all, the Army of Darkness suffered the loss of a battalion's worth of troops, losing 11 marches and 4 regiments in the melee. Among them, four entire tribes of gnolls were totally destroyed as was the most powerful march in the Army, Cvor's all mezzoloth March of the Second Cruelty Regiment.
Cvor's March, or "the Whipmaster's March" as more commonly known among the troops, laid siege to the Silversgate in upper Cormanthor at highsun on the second day of battle, following his orders to guard the gate against any allied incursions while the Fourth Cruelty Regiment sought magical items and plunder in the surrounding buildings and ruins. The Nameless Chosen became enraged by the destruction of his native city and the abrupt slaying of a trio of bronze dragons that had emerged through the gate to lend aid requested a tenday ago. As their overall plans were capable of moving the Army out of the city, the other mages were sadly resigned to the losses, since the Army's battalions had learned to tighten their ranks and attack and raid as an army rather than random hordes. Still bereft of Gaulguth's commanding presence, the troops and attacks were tightly organized to prevent any more losses unless their formations were broken. The Nameless One lost his temper over the "insufferable waiting for the Army to trip hidden spelltraps with no guarantees for success - We are spposed to be the pride and glory of Faerun, but we cower like rabbits waiting for a fox to stop stalking their warren!"
With a roar of anger and vengeance, the Nameless exploded through the roof of one of the Six Tyryl Towers, his body glowing and his hair and robes ablaze in silver flames! Similar to the dragon Garnet's rash charge, he dove headlong into the amassed, "impenetrable" forces of the besieging Army, scattering many gnolls, ogres, and orcs like chaff before a hurricane wind. Driving a wedge through the forces, he converged on the Silversgate, where Colonel Cvor and his mezzoloths stood. Spreading his arms wide, the Nameless One scrawled one line in the shattered marble of the street before him with a beam of silver fire, and no mezzoloth crossed that line that day. On his arms, he formed massive wings of silver fire, raising them high and knocking many creatures down from high towers or parapets. As he walked slowly and steadily forward, the blazing line advanced with him, forcing all back before him. Fully aflame now, the Nameless reached out with his silver wings and flung the nycaloths into the gate, which opened at his merest word. Spelltraps lying in wait activated at his will, causing explosions that claimed more evil lives as he walked unharmed within them. Over 600 mezzoloths, goblins, and other creatures fell before the fury of the Nameless, and Myth Drannor's defenders rallied once more. With a large wedge driven into the Army's forces, the Akh'faer and the cavalry had openings they could exploit and drive the Army before them again.
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