Upon achieving Master Level 1, you must go back to the Arbiter who will give you a choice of 2 Master Level Tracks to choose from. These Tracks determine what Master Level Abilities you receive. You must return to the Arbiter in your realms' Hall of Heroes to gain your abilities for each master level.
Each Track grants one Master Level Ability at each Master Level. While striving for certain of the Master Levels, the player will need to perform certain PvE or RvR tasks. The completion of these requirements is shown in an RvR or PvE experience bar located on either side of the Master Level Sheet (type /master in game).