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Algalon was sent by the titans after Watcher Loken's death activated a planetary fail-safe protection, indicating possible distress on Azeroth. Algalon's task is to analyze any systemic corruption on the planet. If it's deemed beyond saving, the Titans will "re-originate" the planet to cleanse it of corruption, killing all currently living organisms in the process.He can only be accessed if least one member of a raid has obtained the [Celestial Planetarium Key] or [Heroic Celestial Planetarium Key] in Heroic mode. Players have a one-hour window to defeat him per lockout period, starting upon first initiation of the encounter. Blizzard has sardonically referred to him as "Algalon the Raid Destroyer".
Algalon is voiced by Chris Metzen.