Simplify the following text for a Grade 11 native English-speaking person.
Original: As the series progressed , a wider range of enemies was used ; notably Hercules ' half-brother , the malicious god of war Ares , replaced Hera as the show 's primary antagonist .
Simplified: As the series progressed , a wider range of enemies was used ; notably , the malicious Ares , god of war , replaced Hera as the show 's primary antagonist .