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In order to build up an army to conquer Azeroth, the Old God Yogg-Saron corrupted the Prime Designate of Ulduar, the Keeper Loken. When a group of adventurers entered Ulduar to confront Loken, they were left with no alternative but to kill the Keeper.
Loken's death triggered a distress signal to the titan construct, Algalon the Observer. Algalon's mission was to analyze Azeroth for signs of corruption. If it found the planet to be clean, it would send "Reply Code: Alpha" back to the titan homeworld, giving an "all-clear" signal. However, if it deemed Azeroth to be too corrupted, it would send "Reply Code: Omega". This was a signal for Azeroth to be "re-orginated": destroyed, broken down into its base components, and then rebuilt from scratch, killing all lifeforms currently inhabitating the planet.
Learning about Algalon and his mission from a titan computer, the adventurers knew Azeroth had already been extensively corrupted by both the Old Gods and the Burning Legion. Even so, they decided to try to convince Algalon to give the planet a chance...and if all else failed, prevent him from sending Reply Code: Omega by using force.
Confronting Algalon in the Celestial Planetarium, the adventurers failed to convince Algalon to spare Azeroth. Left with no other options, they attacked an entity with the power to rip apart entire planets in the blink of an eye. They could not hope to triumph...but the battle had an unexpected turn. Seeing how his attackers were willing to fight a battle they had no chance of winning to save the lives of thosands, Algalon began to feel empathy for the first time in its artifical life. Impressed with the mortals tenacity and love of life, Algalon rearranged the reply code. Entrusting its care to the adventurers, Algalon left Azeroth, a little wiser in its duties.
"I've seen worlds bathed in The Makers flames. Their their denizens fading without so much as whimper. Entire planetary systems born and raised in the time it takes your mortal hearts to beat once. Yet all throughout, my own heart, devoid of emotion of empathy, I have felt.... NOTHING. A million, million lives wasted. Had they all held within them your tenacity, had they all loved life as you do..."
"Perhaps it is your imperfection, that which grants you free will, that allows you to percivere over all cosmically calculated odds. You prevailed where the Titan's own perfect creations have failed. I've re-arranged the reply code, your planet will be spared. I can't be certain about my own calculations any more."