Rise UpG 55

Simply reach level ten in the Ascended Tower. The tower is a wave based system moving up an elevator with a trial room after every stop that could have a midboss spawn. I do recommend being lvl 50 ascended level 30 or 40 as enemies will be in the high sixties on level 10 and playing with at least 1 other person. You could get really bad luck with banes which are thrown on every 3 or so levels to just make it harder on you.