Ideas and suggestions.

There is another (and quite old) idea that is directly related to the Might and Magic universe. Replace the "Walk on Water" spell on maps without water with "Lloyd's Beacon." "Lloyd's Beacon" is a control spell from the Might and Magic RPG, allowing a hero to teleport from any point on the map to the location where the beacon was previously placed (if another hero is not present there). The beacon should, of course, be visible to the enemy, and to counter it in Heroes, the player would need to position their hero on it. I believe that introducing this spell would balance the schools of magic and, at the same time, not be something absurd or taken from nowhere.