I've been thinking about the Light aspect, since non-esoteric knowledge is part of Light, could a Light player make people believe something false is true? Common knowledge isn't always right after all, same idea for luck, could a Light player give people bad luck as well as good luck? I've always seen a lot of focus on the positives, but never on the negatives, the only thing I don't think a Light player could do is make someone irrelevant without actively making someone else more relevant

It all depends on the Class, really- Even making someone less relevant. I mean, Vriska’s powers pretty much make her sap others’ relevancy on the Meteor and self-insert herself as if she were the leader and savior of everything. A Prince or Bard of Light would be able to destroy relevancy and Alpha-ness, wouldn’t they? Similarly, a maybe a Witch or Heir could be able to manipulate knowledge for deceitful means, and stealing someone’s luck, again, Vriska-like, definitely leaves others having no luck at all.