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Must Deconstruct Faster (10 player)
Defeat XT-002 Deconstructor in 205 seconds in 10-player mode.
Must Deconstruct Faster (10 player) requires defeating XT-002 Deconstructor in Ulduar within 205 seconds, less than half of his 7-minute enrage timer.
Enter Ulduar, reach XT-002
Enter Ulduar and defeat XT-002 Deconstructor. The kill must happen within 3 minutes and 25 seconds, which requires roughly 105% more DPS than a kill near the enrage timer.
Position tank at side wall
Tank XT-002 near the left or right wall so that add spawns are limited to the two scrap heaps at the far end of the room, allowing the first wave of adds to be ignored entirely as they will not reach the boss before the kill.
Save Heroism for first heart phase
When XT-002 emotes 'So tired, I'll rest for just a moment,' the heart becomes vulnerable — pop Heroism and all damage cooldowns immediately, as XT-002 takes twice as much damage during this phase. Continue DPSing the boss for the 5 or so seconds before the heart phase fully begins, and reapply damage-over-time effects since they keep ticking through the heart phase.
Sustain DPS into second heart phase
With sufficient damage during the first heart phase, XT-002 should enter his second heart phase almost immediately after returning from the first. Keep full DPS on the heart and pull back slightly if HP drops too low too fast, as dropping the heart below a certain threshold triggers hard mode.
Use boom bots against scrap bots
If adds do reach the group, stun boom bots when scrap bots are directly behind them, or stun scrap bots when a boom bot is close behind, then kill the boom bot to chain-damage nearby scrap bots.
Tips
Misdirect elite bots onto the tank, or position healers close enough that the tank can taunt them off quickly.
Gear level significantly affects this achievement — groups in half Ulduar-25 loot can complete it with DPS to spare and may need to hold back to avoid triggering hard mode.