Final answer:
The word that completes the antithesis in the question and contrasts with 'delight' by describing the emperor as a 'terror of the universe' is 'frightening'.
Step-by-step explanation:
The first part of the articles addresses the emperor using an exaggeration and an antithesis, saying he is both a "delight" and the opposing word, a "terror of the universe." The word that best completes this antithesis is frightening, as it provides a stark contrast to the word "delight" and conveys a sense of extreme fear or intimidation, which pairs well with the idea of being a "terror." The options provided for the missing word include 'happy', 'pleasant', 'frightening', and 'scary'. Of these, 'frightening' is the word that best fits the context since it describes something that causes fear.