how to change asecendancy?

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Redoing an Ascendancy Trial now allows you to respec which Ascendancy Class you have chosen at the Ascension device, but only if the Trial would grant you the number of points you already have.
In order to respec your Ascendancy class, you must have zero points allocated in it, but you can now talk to Balbala or The Trialmaster to Refund Passive Points.