Webzen announced the release of Global MU Online Season 6-3 update on Dec 21, 2011 GST.
This update is mainly aiming to update a master skill tree of melee-attack character ‘Rage Fighter’. Meanwhile, doppelganger event renewal, another part of Season 6-3 update, will be done in early 2012 as an additional patch.
The Rage Fighter’s master skill is categorized into 3 trees (Spirit, Will, and Destruction) and, like other classes, existing skills can be advanced along with the selected tree.
Shortly after the update, Webzen holds unprecedentedly massive castle siege event on Christmas Day and furthermore, Webzen prepares for special events such as 200% EXP Boost and invitation to Santa Village in celebration of Christmas.
More information about Global MU Online can be found at http://muonline.webzen.com/