I decided that it would be in the best interest for both myself and everyone here to hammer out a consensus on how two of my character's spells effect the characters of varying magic resistance. Here are their snippets from my character sheet:
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Sunder Bolts:
Prana Cost: Moderate
Info: Sunder Bolts is a medium ranged (300m) attack that consists of firing fist-sizedgrey orbs that, upon contact, tears the victim apart from the molecular level by destroying electron bonds in molecules. They can only affect the same amount of area as the orb is, but this tends to be destructive enough for most targets. Like the Firestorm, it can become rapid fire.
Graviton:
Prana Cost: Massive
Info: Graviton is a short ranged (100m) attack that causes its victims to become super dense and collapse onto themselves (Like a hand crushing a soda can). Requires so much prana that it nearly exceeds the mana input from the generator; if fired, Elissa will have a significant reduction in movement and casting ability, for prana is the life-blood of any Warmonger.
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So, here's a table that I cooked up with. It is not finalized in any way, acting more like a prototype. It can be changed as needed while forming a consenses on here.
Sunder Bolts:Nil: Full Effectiveness
E: 90% Effectiveness
D: 70% Effectiveness
C: 50% Effectiveness
B: 30% Effectiveness
A: 10% Effectiveness
EX: No Effect
Graviton:Nil: Full Effectiveness
E: Full Effectiveness
D: 90% Effectiveness
C: 70% Effectiveness
B: 50% Effctiveness
A: 30% Effectiveness
EX: No effect
As for special attributes that already inhibit damage, such as Karna's Kavacha and Kundala, will use a formula that uses Full Effect. So, if one has an attribute that decreases damage to 10%, has an A ranking in magic resistance, and is hit by a Sunder Bolt, the damage received will still be 10% of the total attack rather than 1%.
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So, that is the working basis of effect these spells send out. I would appreciate input so that we can avoid shenanigans when dealing out how much a person is hurt in a fight.