For Mu Online master class characters there are buffs in game X-shop that can be bought by wcoins!
Scroll master of Battle
Critical Damage +25%
Scroll master of Defense
Defense +120
Scroll master of Health
HP +400
Scroll master of Mana
Mana +800
Scroll master of Recovery
Automatic HP recovery +4% HP +200
Scroll master of Strengthener
Excellent Damage +25%
Scroll master of Wizardry
Wizardry +60
Scroll master of Wrath
Attack Power +60