" Nazgrel, what do you make of Thrall's letter?" Rend held a plea for aid from the former Warchief Thrall, asking him to dispatch Horde forces to help Wyrmrest Temple defend itself. After Chromatus, the chromatic dragon Deathwing had sent, failed, the enraged Deathwing decided to act personally and carry out Twilight Judgment.
Large numbers of Twilight Dragons, Twilight's Hammer cultists, and Faceless Ones appeared in Dragonblight, laying siege to Wyrmrest Temple.
While the allied dragon forces were at a disadvantage and focused all their attention on defending Wyrmrest Temple, Twilight's Hammer cultists launched a surprise attack on the Ruby Sanctum at the temple's base.
Their goal was to cast vile magic upon the hundreds and thousands of uncorrupted red dragon eggs within the Ruby Sanctum, forcibly transforming them into chromatic dragons and Twilight Dragons.
At the time, the allied dragon forces of Wyrmrest Temple had committed their main strength to the frontal defenses. At the temple's base, there was only Alexstrasza's consort, Korialstrasz—the former Kirin Tor Archmage of Dalaran, Krasus.
The red dragon eggs in the Ruby Sanctum prevented Korialstrasz from using dragon breath or magic. He could only fight with fang and claw, and after maintaining his High Elf form for centuries, fighting in dragon form was what he was least skilled at.
Although he ultimately killed every Twilight's Hammer cultist, the red dragon eggs within the Ruby Sanctum had all been corrupted by the time-consuming battle.
Under the effects of Twilight's Hammer's vile magic, those red dragon eggs mutated. Chromatic dragons and Twilight Dragons emerged from them one after another, rapidly growing to maturity.
Korialstrasz knew that if the hundreds and thousands of children he shared with Alexstrasza became Twilight Dragons and chromatic dragons, then launched an attack from the lowest level of Wyrmrest Temple, the temple