Black Bolt is one of the Inhumans, who are a race of superhumans, not unlike the superhumans that have developed as mutants. Thousands of years ago they got tired of human's bullshit and left to a secret place called Attilan. They are kind of like Wakandans in that way. They knew they'd just get the short end of the stick if they stuck around. It's one of two options. Either humans would kill them, or they'd want to exploit them. That's what humans do.
Inhumans are already superpowered, but Black Bolt is even more superpowered because his mother got exposed to something called Terrigen Mist. This guy is stacked with power. It's too much power, really. Share some of that power with a guy like me. I want to be able to do a pull-up one day.