Finally reached the adra dragon today. Tried it a few times with different tactics. Might as well have been slamming my head against a concrete wall . Unfortunately, it doesn't feel as the fun/challenging kind of difficulty. Even with minor/mild cheese I didn't make any progress. The damage output is just way to ridiculous. If this thing so much as sneezes over half of my party rolls over, even if I move them beyond their shooting distance. I didn't even get around to really try damaging it. Then there the adds. Xaurips are fine, they're pretty much a non-issue at higher levels and they do add some flavor. But adragons?!? Seriously? Spell casters using the currently incredibly broken charm spells, disabling spells for which no real defence exist? Ultimately, this fight currently feels as if it'll be won with a single failed save. And lots of cheese. And save scumming. And more cheese. I am in no way whatsever opposed to the concept of a superboss. In fact, I love the adradragon and in this game you should and only barely be able to conceive of the notion that you might defeat it (it does seem a fitting enemy for a sequel however ). But not because it sneezes and everybody dies. It's only just short of: 'rocks fall, everybody dies'.
Now that my rant is over; the main issue I have with this battle is the boss' ridiculous damage output. Both the breath attack and the wing slam not only deal a ridiculous amount of damage, easily one-shotting max level characters, but also have such a large radius that evading it is practically impossible. Adding some way to migitate the damage, wether a spell or equipment, could make this battle more fun without changing the spirit of the fight.