hybrid foh / smite don't use light dmg portion of foh, only holy bolt to clear undead/demons and smite for boss/animals
like 20 pts foh, holy bolt, holyd shield, fana then max smite (or maybe res aura, I play HC)
so the aura you use if up to you, probably fanatism (and charge/vigor until enigma, redemption when needed)
this is why I was thinking about using this merc, atc5 might be good too but needs more expensive rws
aiming at farming cs/ubers mainly