The normal Concentration skill expands to include arcane applications, as defined below.
Check: You must make a Concentration check whenever you may potentially be distracted while engaged in an activity, including casting a spell or concentrating on an active spell, that requires your full attention.
If the check succeeds, you may continue with the action as normal. If the check fails, the action automatically fails and is wasted. If you were in the process of casting a spell, the spell is lost. If you were concentrating on an active spell, the spell ends.
The table in the Concentration skill description summarizes the various types of distractions. In situations where the distraction occurs while you are casting a spell, you add the level of the spell to the DC.
Try Again?: You can try again, but doing so doesn't cancel the effects of a previous failure. If you lost a spell, the spell is lost.
Special: By making a check (DC 15 + spell level), you can use Concentration to cast a spell defensively, thus avoiding attacks of opportunity. If the check succeeds, you can attempt the casting without incurring any attacks of opportunity.
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