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Old February 24th, 2004, 12:45 PM
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Default Magic Resistance Formula?

Has anyone figured out the odds of success of a spell cast with penetration P that has found a target of magic resistance R ?
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Old February 24th, 2004, 01:56 PM
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Default Re: Magic Resistance Formula?

Quote:
Originally posted by Zapmeister:
Has anyone figured out the odds of success of a spell cast with penetration P that has found a target of magic resistance R ?
My guess is it's (10 + P + 1D6oe) vs (R + magic bonus + 1D6oe).

1D6oe = 1 six-sided die, open-ended.

P = attacker's penetration, includes bonuses from items + (extra magic skill / 2)

R = defender's MR, includes bonuses from items or spells like Iron Will.

magic bonus: applies if the target's is skilled in the path that's used against it - eg, a nature mage will resist Charm better, an astral mage will resist Soul Slay better. I'd say this bonus is magic skill / 2 (rounded up?), but it's just a guess (hard to test thoroughly because of the open-ended random factor).
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Old February 24th, 2004, 05:35 PM
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Default Re: Magic Resistance Formula?

2D6 (oe)
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Old February 24th, 2004, 06:41 PM
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Default Re: Magic Resistance Formula?

Quote:
Originally posted by Zapmeister:
Has anyone figured out the odds of success of a spell cast with penetration P that has found a target of magic resistance R ?
It's in the first post in this thread.
Dice Roll Chart
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Old February 24th, 2004, 07:17 PM
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Default Re: Magic Resistance Formula?

Quote:
Originally posted by Kristoffer O:
2D6 (oe)
I assume this means the rest is correct, including the 'magic bonus' part?
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Old February 24th, 2004, 07:51 PM
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Default Re: Magic Resistance Formula?

Yep. Not entirely sure of the rounding up, but I believe it is up.
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Old February 24th, 2004, 08:03 PM
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Default Re: Magic Resistance Formula?

I understand that base penetration is 11, or 7 for an "easily negates" spell. So casting a normal "magic resistance negates" spell with no penetration boost versus a normal MR 10 opponent would put you in the "0+" row with a 54% success rate. 2 additional levels in that spell's path give you a +1 penetration, for 62%, and adding a spell focus gives +2 penetration, for "-3+" 76% success.

The row is determened by the minimum roll difference required. So penetration 11 versus resistance 10 requires a roll difference of 0 or greater, as the penetration has to BEAT, not just tie, the resistance.

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