UAX is an acronym that comes from the term [UAS] which means Unlock All Skills. UAS means that you have unlocked all the skills in all of the chapters you own for use on your PvP characters. UAX is a step after that. The X can be anything, much like the common variable X in programming and mathematics. This means that if you have UAX then you have unlocked all the skills, runes and item upgrades in the game.
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