Thank you for your reply. And no need to apologize! I found the apothecary in Pinnacle and mastered the ice maze. Interesting detail about the potion of fire, I never tried to drink one without being frozen.
Now I'm in the end game section, Ignis. I tried it four times but was always annihilated sooner or later. These darn fire mages do so much damage and knock my second row out and the fire elementals make my front fighters dizzy and missing in their attacks the whole time. While the rest of the game was very pleasant to play - some fights were challenging but never unfair - I have to admit I find the final part too punishingly hard. If I see it correctly there is no way to save the game in the last section and I really don't know how to beat it.