A title that is granted to nobles in the Commonweal. They are traditionally the bandit hunters, law enforcers and wandering troubleshooters of the dragonfly lands. They are equipped with masterfully crafted weapons and wear beautifully lacquered chitin armour. There is a tendancy for mercers to be amongst the most skilled warriors, being capable of standing up to a mantis in a duel or defeat many lesser opponents with ease.
They are somewhere between a Knight Errant and a Texas Ranger, from what has been heard and seen of them.
There are two grades of mercer: local Princes can appoint who they wish to the post and these are normally competent warriors and hunters. But those mercers who are personally appointed by the Monarch are those of whom legends are told, outshining their lesser cousins without trying.