What’s “Imperius Rex?”

During the final moments of the battle between Namor and the Black Panther, Namor says “Imperius Rex.” At first it might seem like he’s throwing an insult at the Black Panther regarding her status, but in fact, the phrase is from the comics. “Imperius Rex” is one of Namor’s catchphrases: a Latin phrase (loosely translated to “Emperor King) he uses as a battle cry. Something to say when he’s about to lay the smack down. So it’s just that simple. He’s pumping himself up.