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Supermassive (25 player)
Defeat Algalon the Observer after closing 3 Black Holes within 10 seconds in 25-player mode.
Supermassive (25 player) requires you to defeat Algalon the Observer after closing 3 Black Holes within 10 seconds in 25-player mode.
Understand Black Hole Formation
Black Holes are created when Collapsing Stars die, triggering an explosion. When a Collapsing Star dies it leaves behind a Black Hole void zone, which players can also use to escape Algalon's Big Bang ability.
Position Collapsing Stars Together
Collapsing Stars spawn randomly spread across the room and wander slowly. Kill them as close to each other as possible so the resulting Black Holes are grouped tightly, since you have only until four stacks accumulate to maneuver them closer together.
Kite Living Constellations Into Black Holes
Living Constellations spawn from the ceiling and move toward players — a mobile healer such as a Restoration Druid works well for kiting them. The constellations must be at ground level when they reach a Black Hole, not floating above it, or the Black Hole will not close. Close 3 Black Holes this way within 10 seconds to satisfy the achievement condition.
Exit Black Holes Before Kill
Do not be inside a Black Hole when Algalon dies or delivers his speech, as being inside one at that moment will cause you to lose credit for the achievement with no recourse.
Tips
The two criteria for this achievement are tracked separately, so if you have already defeated Algalon in 25-player mode you only need to close 3 Black Holes within 10 seconds on a subsequent attempt — credit is awarded immediately upon doing so, without requiring a kill.
See the video guides linked for visual examples of the constellation kiting technique.