The Haighlei Empire is a large one, a league of six subcomponent nations, stretching all the way down the far western coast (on the other side of the Pelagirs, apparently) to the southern end of the continent, mostly separated from inland by a steep range of mountains. They're a major naval power, trading with the rest of the continent mostly via Acabarrin in the far south.
They're incredibly averse to change. Their society is rigidly governed by protocols and, relative to the rest of the world, has barely changed over millennia. This seems to be something their gods encourage. One of their traditions is the Eclipse Ceremony; approximately every twenty years, at a solar eclipse, is the only time any changes to their civilization can be voted through.
Their culture also has stronger control and regulation over Gifts than anywhere else in the known world. All children above age six are tested regularly for mage-gift, and those found to be Gifted - it sounds like they have a way to determine which Gifts will awaken versus remain in potential when children are still quite young - are taken away from their families to be trained as priests. Any judged not to have the virtue and temperament required for the priesthood have their Gifts burned out and are sent home in disgrace. Mind-Gifts are even more controlled; their use is banned entirely except for some variant of Truth Spell.