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A fresh idea (maybe not so fresh, but I haven't encountered anything like it). Another attempt to make Eagle Eye a viable skill. So...
Basic Eagle Eye: allows the hero to use 2 spells at once every 10th round of battle. Advanced - every 5th round. Expert - every 3rd.
Of course, the numbers are just for example and need to be tested.
In Kings Bounty:
"Basic - 2 spells twice per battle.
Advanced - 2 spells twice per battle.
Expert - 2 spells three times per battle."
Quite the skill.