so i had to redo all math bc i forgot to aply convic -res against non immunes to fire without any Scharm
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No charm+amp+convic,
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venom lords will remain immune to fire but their phys res will be at -50% making you deal 75% (0+[50+50%]) of your CE dmg
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oblivion knights will be sitting at -25% fire res and -67% phys res making you deal 146% ([50+25%]+[50+67%]) of your CE dmg
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finger mages will be sitting at -85% fire res and -50% phys res making you deal 167.5% (50+[50+50%]) of your CE dmg
(75%+146%+167.5%)/3 = +29,5% overall CE dmg
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FSunder+amp+convic
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venom lords will sit at 83% fire res and phys res will be at -50% making you deal 83,5% ([50-83%]+[50+50%]) of your CE dmg
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oblivion knights will be sitting at -15% fire res and -67% phys res making you deal 141% ([50+25%]+[50+67%]) of your CE dmg
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finger mages will be sitting at -85% fire res and -50% phys res making you deal 167.5% ([50+85]+[50+50%]) of your CE dmg
(83.5%+146%+167.5%)/3 = +32% overall CE dmg
thats it, using a FSunder in CS will give you +2,5% overall CE dmg with the penalty of having to compensate the -70% fire res
so the player should ask himself, if its worth
in my opinion its better to dedicate those smc to MF instead of fire res