Hi there. Most prismatic chests reward Fragments, which are unlocked account-wide with whichever character you opened them with first. If you open a prismatic chest and receive only glimmer and XP, then you've already got the reward.
The last Prismatic abilities are obtained by doing the 6 Adventures launched in the old tower: Home Part 1&2, Queens Part 1&2, and The Hollow Part 1&2.
Your first character to complete the campaign will get the Destined Heroes quest, which guides them through those adventure missions. It is a one-time quest, so your alt character can get their abilities by launching the adventures directly in the old tower, without a quest.
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The issue is that I haven’t done those quests on my warlock so that makes sense. Thanks for the info!