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Heartbreaker (25 player)
Defeat XT-002 Deconstructor after destroying his heart in 25-player mode.
Heartbreaker (25 player) is earned by defeating XT-002 Deconstructor in 25-player mode after triggering and destroying his heart to activate Hard Mode.
Enter Ulduar raid
Enter Ulduar and make your way to XT-002 Deconstructor. To trigger Hard Mode, you must destroy his heart when it becomes exposed — this happens every 25% HP he loses.
Expose and destroy heart
When XT-002 reaches a health threshold, his heart becomes vulnerable. Destroy the heart before he retracts it. At lower gear levels, removing your weapon and dealing reduced damage can help you time the heart phase correctly without killing XT-002 prematurely.
Survive the Heartbreak buff
Destroying the heart triggers the Heartbreak buff, which heals XT-002 to full HP and significantly boosts his damage and total health. In this Hard Mode state, Gravity Bombs will spawn void zones and Life Bombs will spawn Life Sparks that cast Static Charged on the raid. XT-002 no longer enters exposed heart phases after this point, meaning no more add spawns from those phases but also no stun or damage bonus window.
Defeat XT-002 Deconstructor
Defeat XT-002 Deconstructor while the Heartbreak buff is active to complete the achievement.