Henners

I did the same thing. I was like....oh...they didn't make him immune to this... da fug. I'm so used to bosses being immune to any sorta one shot thing it surprised me. Seriously onty did it on a whim. I reloaded though to see how hard he would be without doing it and still wasn't that tough. And his buddies dropped like minnows. Reminded me of the old Phoenix down trick from earlier FF games lol. Might be an unpopular opinion, but I really like this kind of thing. It rewards you for knowing the mechanics. Pretty much any DnD based game has this kind of stuff in it, especially the old infinity engine games. True, though in this particularly case there is certain amount or irony in using a priest, and therefore god granted, spell to instakill the guardian that moments before the gods have told you they are unable to influence..... Dismissal did become one of my favourite spells for late game exploration given the amount of undead hordes on some of the more remote islands. The only unexplained question I have is why it doesn't work on fampyrs - fampyrs, particularly ancient ones, became the only really threatening enemy towards the end due to their habit of charming your party members.

If you are struggling with the "mecha dragon" I found a cheap way of outright killing it on my first attempt. It is a construct. There is a certain level 8 priest spell that instantly destroys this type of enemy. Yes, it works. I laughed at the screen for a good 30 seconds afterwards.