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From level 20 onwards, you get class quests for your monk that gives you some gear, and most importantly, a 50% increased XP buff for 2 hours. One of the later quest rewards is an ilevel 450 staff, and at max level you get 2999 mastery from the daily.
There's one quest for every 10 levels starting at level 20, and one daily quest for all levels. You get 1 hour per buff, and a max of 2 hours, so if you complete 2 quests and a daily quest you will lose out on one our of the buff.
The quests are located at Kun'lai summit, where monks can teleport with a class ability. Several of the NPCs are also profession trainers and vendors as listed below.
Master Hwang: A staff vendor who sells all the old staffs from the class quests (technically staves/polearms)
Master Marshal: Who teaches Herbalism/Inscription
Master Cannon: Who teaches Skinning/Leatherworking and sells all the old leather belts from class quests
Master Chang: A 'Brewmaster' who teaches cooking and sells Monk-specific brews that restore health/mana and give buffs (Lowest Level Food; 20, Highest level Food; 80)
Master Tan: A Fist Weapon Vendor who sells fist weapons from Level 30 right through to Level 85
Master Lo: A fishing trainer
Master Bier: A First Aid trainer
Master Brandom: Who teaches Mining and Blacksmithing
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