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altering defensive casting to scale better with expected numbers and encourage lower level spell casting in threatened areas
====[[Tome of Prowess (3.5e Sourcebook)/Arcana#Defensive Casting|Defensive Casting]]====
Casting in combat is difficult, since making sure that you cast the spell right often means that you leave yourself open for a moment. It takes focus to do both, and the more deeply you understand your magic the more easily you can do so. As part of the action to cast an arcane spell, you can attempt to cast it defensively.</onlyinclude> This check is rolled once, and the result used against the DC for each opponent threatening you in melee. The DC for each opponent is 10 15 + their BAB or twice the spell level+ your opponent's base attack bonus, whichever is greater. The DC increases by 1 for each person beyond and you suffer a penalty to this check equal to the first who threatens number of foes threatening youminus one.
'''Base DC:''' 10 15 + twice the spell 's level or 10 + opponent’s BAB, whichever is greater; +1 for each person beyond the first that threatens you<br/>
'''Check Result:'''
*DC+0 and above: Your casting of the spell does not provoke an attack of opportunity from this opponent.
