Is possibile to cast Arcane Scools powers on the defensive?
And if yes,
how is the DC?
Thank you :)
You may attempt to use a spell-like ability on the defensive, just as with casting a spell. If the concentration check (DC 15 + double the spell's level) fails, you can't use the ability, but the attempt counts as if you had used the ability.
However, I'm also curious: what would a school power's spell level be, if it has no direct relationship to an existing spell? For example: what about an evoker's force missile and elemental wall spell-like abilities? Would the former be considered a 1st-level spell, since it's gained at 1st level, or the latter be equivalent to a 4th-level spell, since it's gained at 8th level? Hmm . . .
You may attempt to use a spell-like ability on the defensive, just as with casting a spell. If the concentration check (DC 15 + double the spell's level) fails, you can't use the ability, but the attempt counts as if you had used the ability.However, I'm also curious: what would a school power's spell level be, if it has no direct relationship to an existing spell? For example: what about an evoker's force missile and elemental wall spell-like abilities? Would the former be considered a 1st-level spell, since it's gained at 1st level, or the latter be equivalent to a 4th-level spell, since it's gained at 8th level? Hmm . . .
These were my thoughts and also my doubts :D
If it's a supernatural ability then no, you can not use it defensively.
This is because you do not have to.
For those that are spell-like instead the "rule of thumb" (which is not RAW) is to use 1/2 the class level at which it is obtained as the spell level of the ability.