Dofin
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I played as the good-aligned Kirill, although it was a bit inconvenient (I had to rebuild cities), and the tearful mage is weaker than the bloodthirsty one in terms of their ultimate skills, but overall, it's still quite easy. Because Kirill is too tough.
As for the chain lightning spell, the AI won't use it if you set up a single stack against it (any unit with high hit points).
P.S. As a bonus to the demon playthrough, there's an easy achievement on the angel difficulty: petrify one of the guards, inflict hatred on the lords for 10k+ damage (all of them except the petrified one will fall), and the achievement is yours in 2-3 turns.
As for the chain lightning spell, the AI won't use it if you set up a single stack against it (any unit with high hit points).
P.S. As a bonus to the demon playthrough, there's an easy achievement on the angel difficulty: petrify one of the guards, inflict hatred on the lords for 10k+ damage (all of them except the petrified one will fall), and the achievement is yours in 2-3 turns.