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Hidden Dragon
Hatch the cloud serpent egg during the Jadefire Masters encounter in the Battle of Dazar'alor on Normal difficulty or higher.
Hidden Dragon is a 10-point achievement earned by hatching a cloud serpent egg during the Jadefire Masters encounter in the Battle of Dazar'alor on Normal difficulty or higher.
Enter Battle of Dazar'alor
Enter the Battle of Dazar'alor raid and make your way to the Jadefire Masters encounter. The egg location in the arena differs depending on whether you are playing Horde or Alliance.
Pick Up the Egg
After the first set of Living Bombs has been dealt with, pick up the Jade Serpent Egg in the Jadefire Masters arena. Picking it up before the Living Bomb explosions resolve avoids the risk of the egg being destroyed, and the egg must be retrieved before phase 2 begins, as Phoenix Strike will break it.
Protect the Egg from Fire
While carrying the egg, keep it away from fire sources throughout the encounter. Do not drop a 
Party Totem during the fight, as the random shards it spawns will cause the egg carrier to drop the egg. Also avoid having the Worldvein Essence equipped on the egg carrier, as its random shard spawns will also break the egg.
Receive Dragon's Breath
Ma'ra Skywatcher, the Monk, transforms into a Jade Serpent at 100 energy. Stand in her Dragon's Breath ability while holding the egg to hatch it.
Kill the Boss
After the Dragon's Breath hits the egg carrier and the egg hatches, kill the remaining boss to complete the achievement.
Tips
When soloing as a pet class, instruct your pet to attack the barrier using the direct Attack command rather than any targeted ability, as using targeted pet attacks can cause the achievement to fail.