Mastery

Mastery occurs when one reaches the max skill level for any given skill. This is achieved by practicing all of a skill's leveling weights. Mastery in a skill will be uncommon and very difficult. Even if a player practices all the leveling weights for a skill, they have to apply it to high-ranked players and monsters as well, or they will reach a plateau and stop gaining experience. For example, for Strength, one of the leveling weights is to frequently cause your enemies to lose balance. If you're only making level 1 cows lose balance and not any high level monsters or players, you won't be able to advance.