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The question is this: the magic arrow deals fire damage, but if a unit has immunity to fire, the magic arrow still deals damage. I thought that in this case, the damage would be physical, but if the unit has the "Enchanted Armor" ability, then the magic arrow deals no damage. Just in case, I tested it with immunity to all elements, and damage is dealt from all of them. The question is, how is this possible? Perhaps there is another type of damage in the game besides magic and physical, or is this just a bug?