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Infinite Power XII
Gather 4200 Threads for the Cloak of Infinite Potential.
Infinite Power XII requires you to gather a total of 4200 Threads for the 
Cloak of Infinite Potential, rewarding the August Celestial Wings toy set upon completion.
Track Your Thread Progress
Use this macro to sum all your Threads across every currency slot: /run local c,s={0,1,2,3,4,5,6,7,148},0;for i=1,9 do s=s+C_CurrencyInfo.GetCurrencyInfo(2853+c).quantity end print("Total threads: "..s). This gives you a live running total toward the 4200 required.
Complete Quests for Threads
The primary sources of Threads are quest completion rewards from 
Cache of Infinite Treasure and item drops. One player reached 4200 Threads after completing 632 quests, progressing through all zones up to roughly 75% of the Campaign: Townlong Steppes, logging approximately 22 hours of played time.
Farm Thread Drops by Level
From level 10 onward you begin receiving Thread drops such as Thread of Critical Strike, each increasing your total by 1; higher-level drops grant more Threads per item.
Collect Your Toy Rewards
Upon completing the achievement, four toys are placed directly in your bag: 
Fury of Xuen, 
Kindness of Chi-Ji, 
Essence of Yu'lon, and 
Fortitude of Niuzao.
Tips
Any alt that already exists must unequip and then re-equip the Cloak of Infinite Potential to correctly apply the achievement bonuses; without doing this the bonuses will not update.
When an alt first benefits from this achievement milestone it receives +150 Primary Stat, +750 Stamina, +150 Versatility, and +100% Experience as its baseline bonuses.