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Discord is far from a dumbass hes very intelligence he manipulated the mane 6 in his first appearance but lose because he didn't get rid of the elements. He was manipulating the trio for months before getting betrayed when he underestimated them. He has often manipulated events to go his way. He came up with the plan to free starlight which he had to trick 3 smart villains to do. The problem is his extreme arrogance bites him in the butt whether and at times stil struggling with friendship then actually being dumb.