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I'm too lazy to do tests.
I checked the files (if I looked there). Magic arrows have the fire element, but the damage is "DamageIsElemental>false".
Element and "DamageIsElemental>false" - magic arrow
Element and "DamageIsElemental>true" - Armageddon, chain lightning, stopping cold, earth shock, wall of fire, and meteor shower.
Element and no "DamageIsElemental" - fireball, boulder, ring of cold, and lightning and stone spikes.
No element and "DamageIsElemental>true" - divine retribution.
No element and no "DamageIsElemental" - magic fist (physical damage).
I checked the files (if I looked there). Magic arrows have the fire element, but the damage is "DamageIsElemental>false".
Element and "DamageIsElemental>false" - magic arrow
Element and "DamageIsElemental>true" - Armageddon, chain lightning, stopping cold, earth shock, wall of fire, and meteor shower.
Element and no "DamageIsElemental" - fireball, boulder, ring of cold, and lightning and stone spikes.
No element and "DamageIsElemental>true" - divine retribution.
No element and no "DamageIsElemental" - magic fist (physical damage).