SUPER HEREOS!
Get your power, your masks and capes snatched

from Yasiin Bey – Speed Law Lyrics on Rap Genius

Reference to the “evolution” of rappers into larger-than-life personalities, whose persona is an alter ego.
Powers, masks, and capes — a reference to the now-standard items such as a the chains, skull-caps, rims, all the things that externally display the power of the fake rappers. Mos Def, by comparison, needs none of that. Like Superman, he looks ordinary in daily life, and it is only when he picks up the mic that the super power comes out.

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