1. To complete the bad luck professional jewelry task, you must obtain the trigger for this task:

Warlock: the shadow of bondage

Master: Master Ao's recipe.

Thief: Garona: a study of covert operations and tricks

Shaman Priest: You and Frost Shock

Hunter: the greatest hunter

Druid: Emerald Dream

Father: Light won't tell you anything.

Paladin: The Power of Light

Warrior: The Book of Defense

2. Task method

It is simple to complete the task, and books can be bought at the auction house (unlucky boss and books are dropped). After accepting the task, find a thief to unlock 300 or a player with a key to help open the Doomsday North Library door and hand in the task to complete.