Yes, it is possible because I have already completed the demo on the highest difficulty mode.
I accumulated damage to finish the fight before Nightmare cast the final attack, perhaps to reset the casting time of the final attack.
What level were you when you beat here? i'm lvl20-23 and i dont do alot of damage still trying to find her weakness
I faced her around these levels, I don't remember much, but what I suggest is that you avoid the yellow fey attacks because the Nighmare is immune.
I don't know what spells you have or the rank level of your witches.
But I suggest you leave aside the healing spells and only use the combo heals.
