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<blockquote data-quote="Spatzimaus" data-source="post: 521151" data-attributes="member: 3051">To cast defensively, the DC shouldn't depend on the BAB of the people attacking you, because if you're being threatened by multiple people one of them is getting a freebie.I wanted a system where you were less likely to fail the check, but where succeeding wasn't as powerful as it is now.&nbsp; The current system is practically impossible for a low-level caster to use, but at high levels it's impossible to fail.&nbsp; Try this:To cast defensively, make a Concentration check (DC 10 + spell level).&nbsp; Failing the check causes the spell to be lost.&nbsp; Succeeding raises your AC by 1 point for every 2 points you exceed the DC by (rounding fractions down, of course); it's a dodge bonus that only applies to AoOs caused by the casting action.Example: I'm a level 5 Wizard.&nbsp; I have AC 20, Concentration +8, and I'm casting a 3rd-level spell.&nbsp; I decide I want to try to avoid the AoO.&nbsp; DC is 13, so I fail on a 1, 2, 3, or 4 (20% of the time).&nbsp; If I roll a 5 or 6, I keep the spell but my AC is unchanged.&nbsp; If I roll 7 or 8, my AC is +1, and so on all the way up to +7 AC for rolling a 19 or 20.The Feat &quot;Combat Casting&quot; allows you to Take 10 on this check.&nbsp; In the example given, this'd allow him to automatically cast defensively on all of his spells, but the AC boost would be small.</blockquote>

[QUOTE="Spatzimaus, post: 521151, member: 3051"] To cast defensively, the DC shouldn't depend on the BAB of the people attacking you, because if you're being threatened by multiple people one of them is getting a freebie. I wanted a system where you were less likely to fail the check, but where succeeding wasn't as powerful as it is now. The current system is practically impossible for a low-level caster to use, but at high levels it's impossible to fail. Try this: To cast defensively, make a Concentration check (DC 10 + spell level). Failing the check causes the spell to be lost. Succeeding raises your AC by 1 point for every 2 points you exceed the DC by (rounding fractions down, of course); it's a dodge bonus that only applies to AoOs caused by the casting action. Example: I'm a level 5 Wizard. I have AC 20, Concentration +8, and I'm casting a 3rd-level spell. I decide I want to try to avoid the AoO. DC is 13, so I fail on a 1, 2, 3, or 4 (20% of the time). If I roll a 5 or 6, I keep the spell but my AC is unchanged. If I roll 7 or 8, my AC is +1, and so on all the way up to +7 AC for rolling a 19 or 20. The Feat "Combat Casting" allows you to Take 10 on this check. In the example given, this'd allow him to automatically cast defensively on all of his spells, but the AC boost would be small. [/QUOTE]

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