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The following spells impressed me the most, as they are only implemented in the second expansion pack:
“Freezing Cold.” This spell is slightly weaker than “Earth Shock,” but it has significant advantages: it’s cheap and deals increased damage from physical attacks. This allows you to quickly eliminate even the strongest unit that is frozen by this spell.
“Divine Retribution.” If a unit deals massive damage to our units, the spell will inflict the same amount of damage, possibly even more than the enemy unit’s damage.
“Vampirism.” Powerful creatures like red dragons restore their health and numbers with considerable power. It is recommended to use this spell in most situations.
“Crystal Prison.” Because it can block ranged units, and the explosion damage is decent. It is especially effective when used in a cluster of enemy units.