True skill mastery

True skill mastery is an achievement greater than skill mastery currently obtainable only by reaching level 120 in Dungeoneering. The achievement was released 12 April 2010 with the release of Dungeoneering. When a player reaches level 99 in Dungeoneering, they can continue to proceed to level 120 to receive a true skill cape. Currently, this is unique to Dungeoneering; thus it is not possible to (permanently) exceed level 99 in any other skill. The true mastery skill cape (according to the skill interface) does not look much different from the ordinary level 99 skill cape, and it is unknown if it will have a "true skill cape" emote, or any other additional bonuses.

104,273,166 experience is needed to reach level 120. This is about 8 times the experience as 'Skill Mastery'. No player has level 120 in Dungeoneering at this time, and only 139 players (as of 7 June 2010) have reached level 99. It appears that Jagex currently has no plans to raise the level cap for any other skills. There are only floors up to level 69 (floor 35), so there are no special floors for true skill masters, although reaching level 120 does give a player the ability to bind up to four items. In the future, it is also very likely that it will give access to a very special area accessed by a Mysterious Entrance.