From Portals of Phereon Wiki

A special trait on units you recruit from the King.

They cost 1000g upfront and require 1120g in upkeep per day.
They will be a random Base Species with two random genetic trait and a Max Level of 20. Getting them injured or killed will greatly reduce relations with the King. They will have 15-25 randomly distibuted genes.
They can't be used for Breeding, Fusion or rituals either.

When you turn them in you get 500g for every level they gained. Do it before the day rolls over, and you don't have to pay that upkeep either.

Also see Soldier