What do you think it could be? For me it could be terraforming or pure light that the traveler used
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I think after the next dark subclass - we will see expansions to the prismatic sub class, not only to include abilities from the third dark of class, but also new abilities and supers Besides that, I think the inclusion of the prismatic class has opened up the game to additional side class systems - ones that are separate from the light and dark sub classes