John_Connor said:It's mainly the fact that a sorc can wear two of them and the auras will
1. add together (to give lvl 30 or whatever holy shock)
2. get multiplied by her lightning mastery
Of course pallies use them too, and to good effect on auradins (they can have several holy auras on at once thanks to items and still have max fanaticism or conviction going)
So the short answer is, mainly the aura makes it good. The res and fhr are a bonus.