Concentration

You can focus your mind on a task, despite serious distractions.

You must make a Concentration check whenever you might potentially be distracted (by taking damage, by harsh weather, and so on) while engaged in some action that requires your full attention. Such actions include casting a spell, concentrating on an active spell, or using a skill that would provoke a reaction attack (such as Heal, and Tamper, among others). In general, if an action wouldn’t normally provoke a reaction attack, you need not make a Concentration check to avoid being distracted.

If the Concentration 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 (see Cast a Spell, ???). If you were concentrating on an active spell, the spell ends as if you had ceased concentrating on it. If you were directing a spell, the direction fails but the spell remains active. A skill use also fails, and in some cases a failed skill check may have other ramifications as well.

The table below summarizes various types of distractions that cause you to make a Concentration check. If the distraction occurs while you are trying to cast a spell, you must add the tier of the spell you are trying to cast to the appropriate Concentration DC (See Concentration, page ???, for more information). If more than one type of distraction is present, make a check for each one; any failed Concentration check indicates that the task is not completed.

Distraction	Concentration DC
Damaged during the action	10 + damage dealt
Distracted by a nondamaging spell	Spell's save DC
Vigorous motion (a moving mount, or a small boat in rough water)	10
Violent motion (a galloping horse, or a storm-tossed ship)	15
Extraordinarily violent motion (an earthquake, a collapsing building)	20
Grappled or held ???	???
Bad weather (high wind an blinding rain or sleet)	5
Wind driven hail, dust, or debris	10

Casting Defensively

You can use Concentration to cast a spell defensively, so as to avoid reaction attacks altogether. This doesn’t apply to other actions that might provoke reaction attacks (such as movement or loading a crossbow). See Casting on the Defensive.