Here is my final version of my minority report on the Templar.
According to the fluff of the original boxed set, the Templars generally had some training other than being Templars. Most often martial training as a fighter, but also psion and other classes. In 2E there wasn’t really any way to implement this well, and there were no prestige classes. In athas org 3E, they went with a Templar base class.
What I have done is made the Templar a prestige class that can be entered into at the 6th character level. The entry requirements are forgiving, and virtually any base class will be able to fulfill the entry requirements. The Templar PrC has a interesting method of interrogation, and a unique “pseudo-domain” mechanic that makes the Templars serving under different sorcerer kings different from each other.
Download link below.