Ajanfindel was massively prep heavy, far moreso than average. He routinely fought with aura and shield on him as well (and he preferred to have a healer with him or he would simply log out if the odds were even slightly unfavorable). Both aura and shield are limited preps and can be hard to come by unless you know your stuff.

They typically can be found in potions for fighters, but are relatively rare and hard to find.