I think I have found a bug. I spent my champion medals on a skill (Artificer), but later reloaded to a save before that decision, because I had misunderstood what it did (I thought that it gave me an extra equipment slot to select an equipment to give characters on top of their starting three things, it actually gives a third slot with which to hold a book). Visiting the vendor again, I notice that Artificer is no longer in the list of available purchases, which makes me wonder if my having it somehow transcended the save (even though I have the champion medals back and can buy other things).
Upon starting a new game after defeating what appeared to be the final boss, I found that Artificer was available to select, as was the thing I ended up choosing instead after I reloaded (Ancestral Prowess). This implies that one could simply repeatedly reload the point immediately before the medal vendor and buy out all the things, and have access to them the following game... (Of course, it's a bit of a moot point for me, since these appear to compete with the slot for the absolutely-vital Mana Bolt :P)
Another bug: Panacea claims to prevent status effects for the rest of the battle, but I was still able to get cursed again after using it. (Also, I'm not clear on what exactly curse is supposed to do...)
Also, spoilers below for anyone reading this who hasn't played the game, but I'm a bit confused by Sarundar's dialogue before the boss fight. I was under the distinct impression that Irinia was in the wrong and I would be walking the same path as Sarundar did, but I don't seem to actually be able to tell him this.
... And upon defeating him, my impression that fighting him would lead to a bad outcome seems to have been correct. "In my demise, the fate of the world is sealed" indeed.
Is this actually the end? I was kind of hoping to actually experience the looping system, lul.