Brone was banished from his pride, along with his twin sister Phobe, at a young age.
No it was not because he was a male that threatened his father's legacy. No it was for Phobe's and Brone's cruelty and malicious actions toward those in the pride. All actions were done simply because they were bored.
Now the two of them roam as rouges, leaving bloody bodies of victims that are unfortunate enough to come in contact with them.