Phoenix in my opinion isn't that outrageous, but it has to be a scroll, so you don't have enough magic crystals to get it to level 2. Demoness gets hypnosis so it sounds fair.
Other option i considered is last hero, only thing i don't know is if troops take damage when the battle ends, if not some nice planing can lead to no loss victory. Haven't tested it as i went with phoenix approach.
Damage spells simply don't cut it, even the most powerful ones.
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