Culture: Actually, this is the culture of many races. It's known as the culture of angels, because within the walled Dominions, an angel rules.
Not much, though, they're more of a war chief than anything else. They have taxes enough to keep the whole place from going broke and they're there only in case of a gigantic disaster. Traditionally the position is passed from mother to daughter or sister to sister. There are a few exceptions and in later times, people made less and less of a deal out of a Neseph or a prince consort actually doing the work it takes to maintain a large city-state.
There are few things angles don't' get along with. Elves haven't' been popular for along time, considering there have been two wars with them. Lately, though, the angels have realized they weren't as much of victims as they thought and have been trying to repair relations with them.
Magic: Of the common Sidra, angels are both the most powerful and the most precise. That's why they're in charge. No point in Hawkman fighting supervillains when you have superman.