Corlindale
Emperor
How about making it so Corlindale can only use his abilities while his civ isn't at war with anyone?
Wouldn't that make him fairly useless except for casting peace-time city boost buffs like any mage can?
In wartime I think he would be most at his guard, being very eager to stop the violence quickly, and attempting to protect his people without compromising his own vow, through the use of aforementioned spells.