In campaigns, it's actually quite possible... I leveled up to the maximum, i.e., level 70. At the same time, this was a hero possessing all magic skills except for Haven. Instead, he had Tactics.
So, here's what he could do:
- Disintegrate: 2816 damage
- Chain Lightning: 2048
- Suffocate: 2304
- Lightning: 1792
- Fireball: 1280
- Armageddon, Inferno, Fireball: 1024
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