There are also issues with Fire Mage's runes
Firebolt doesn't decrease resistances at all (It's supposed to decrease 5% per hit up to 15%)
Fireball decreases 20% per hit instead of 5% per hit (as in description)
Small firestorm decreases 25% per hit instead of 10% per hit (as in description)
Fire explosion decreases 35% per hit instead of 20% per hit (as in description)
Big fireball decreases 30% per hit instead of 15% per hit (as in description)
Firewave decreases 35% per hit instead of 20% per hit (as in description)
Big firestorm decreases by 40% per hit instead of 25% per hit (as in description)
Fire meteor decreases by 40% per hit instead of 25% per hit (as in description)
Fire rain decreases by 65% per hit instead of 50% per hit (as in description)
On top of that, additional % reduction from Fire Protection doesn't affect them at all in current state