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Fire Shield M points for D seconds
This effect does two different things. First, it provides M% Resist Fire, thus reducing Fire Damage by M%. Secondly, enemies next to the casting character will be damaged at 1 point elemental damage per 10 points spell strength each time they successfully hit the caster with melee attacks.
According to the OpenMW code, the formula is quite a bit complex and includes a spell resistance check, elemental resistance and is further modified by the difficulty scaling.
Attacker's Magic Resistance Test:
MagicResistance = (AttackerDestruction + 0.2 AttackerWillpower + 0.1 AttackerLuck) * 1.25 * AttackerCurrentFatigue / AttackerMaximumFatigue - RNG0-99
Attacker's Total Resistance
TotalResistance = max(100, AttackerElementalResistance + MagicResistance )
Fire Shield Damage
FireShieldDamage = DifficultyModifier * fElementalShieldMult * SpellMagnitude * (1 - 0.01 * TotalResistance);
The Attacker's Magic Resistance test checks attacker's own skill of destruction, together with Willpower and Luck, against a random roll. This value is then added to attacker's own elemental resistance.
The DifficultyModifier modifier is always in disadvantage of the player.
With the default value of fElementalShield being 0.01, we get back to the above value of 1 point of elemental damage per 10 points magnitude, but with attacker's own destruction skill and elemental resistance helping reduce the damage.
- While the color of the icon for this effect is red, implying that it is a Destruction spell, it is indeed Alteration.
- Unlike in Oblivion, elemental shield spells in Morrowind will not increase a character's armor rating. By using magic, increasing armor rating is achieved with either the Shield or Bound Armor spell. You may also fortify a character's armor skill through Restoration.