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Many Whelps! Handle It! (25 player)
Cause 50 Onyxia Whelplings to hatch within 10 seconds of Onyxia's liftoff, and then defeat her in 25-player mode.
Many Whelps! Handle It! (25 player) requires you to cause 50 Onyxia Whelplings to hatch within 10 seconds of Onyxia's liftoff and then defeat her in Onyxia's Lair on 25-player mode.
Enter Onyxia's Lair
Enter Onyxia's Lair and begin the fight with Onyxia. When the fight starts, she will yell in red chat text: 'How fortuitous, Usually, I must leave my lair to feed.'
Watch for Phase 2 Text
Bring Onyxia down to 65% health to trigger Phase 2. Watch your chat frame for the red text yell from Onyxia: 'This meaningless exertion bores me. I'll incinerate you all from above!' — this is your signal to immediately run through the eggs.
Sprint Through the Eggs
The moment that second red text line appears, sprint through the egg clusters to hatch 50 Onyxia Whelplings within 10 seconds. Use a 
Potion of the Psychopomp's Speed along with any available speed enchants or talents to cover the egg areas fast enough.
Defeat Onyxia
After hatching the required whelps, finish the fight and defeat Onyxia — the achievement will be awarded upon her death.
Tips
Speed increases from potions, enchants, and talents are essential to hatching 50 whelps within the 10-second window, so equip movement-speed bonuses before the pull.