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In Into the Tides, people who have magic are called "Powers." Each type of magic has a different set of capabilities, which is based on genetics. And for each Power type, there are 6 different levels of ability, called classes, with 6th class being the weakest and 1st class having the most magic. How a person's class is determined is based on what they can do.
I've been working on creating descriptions that explain what each Power type can do, by class. (Okay, yes, I've probably been having too much fun with this... ;) If you're reading the book and wondering what the characters are capable of, and what they would be capable of if they were higher in class, you can find out!
Here's more about regeneration Powers, who are only briefly mentioned in the book: