When Archimonde's invasion of Azeroth had begun and Azshara's treachery became known, Malfurion convinced Illidan to leave his queen. Illidan followed his brother. But as Cenarius and the dragons entered the battle, Malfurion came to understand that their adversaries were too powerful to fall in combat. To end the invasion, he plotted the destruction of the Well of Eternity. The idea appalled Illidan. The Well was the source of his magic — and likely of the elves' immortality — and its loss was a price far too dear for him to pay. In addition, the night elf found that he increasingly admired the powers of the Burning Legion, seeing a magical purity that underlay their chaotic behavior. Where the night elves struggled to maintain their ground, the Burning Legion's numbers did not seem to permanently diminish.