The additional abilities come from the 6 Adventures in the Pale Heart Tower. The fragments come from Prismatic chests with a variety of different requirements.
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Does that mean the Alone in the dark quests? On my 2nd character, my Warlock I have completed Alone in the dark twice and my Arc and Strand subclasses have not unlocked. I wanted. To research before I did it a 3rd time. 😵💫