Check: 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, directing a spell, using a spell-like ability, or using a skill that would provoke an attack of opportunity. In general, if an action would not normally provoke an attack of opportunity, 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. 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. If you were using a spell-like ability, that use of the ability is lost. A skill use also fails. In some cases a failed skill check may have other ramifications as well.
The table below summarises various types of distractions that require you to make a Concentration check. If the distraction occurs while you are trying to cast a spell, you must add the PP cost of the spell you are trying to cast to the appropriate Concentration DC. 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.
|10 + damage dealt||Damaged during the action.2|
|10 + half of continuous damage||Taking continuous damage during the action.3|
|Distracting spell’s save DC||Distracted by non-damaging spell.4|
|10||Vigorous motion, such as on a moving mount, taking a bouncy wagon ride, in a small boat in rough water or below decks in a storm-tossed ship.|
|15||Violent motion, such as on a galloping horse, taking a very rough wagon ride, in a small boat in rapids, on the deck of a stormtossed ship.|
|20||Extraordinarily violent motion, such as an earthquake.|
|20||Grappling or pinned. You can only cast spells without somatic components, and only if you have any required material components in hand.|
|5||Weather is a high wind carrying blinding rain or sleet.|
|10||Weather is wind-driven hail, dust, or debris.|
|Distracting spell’s save DC|
1 If you are trying to cast, concentrate on or direct a spell when the distraction occurs, add the PP cost of the spell to the indicated DC.
2 For example, damage occurs during the casting of a spell with a casting time of one round or more or the execution of an activity that takes more than a single full-round action, such as Disable Device. Damage may also stem from an attack of opportunity or readied attack made in response to the spell being cast (for spells with a casting time of one action) or the action being taken (for activities requiring no more than a full-round action). See also Distracting Sorcerers, page 210.
3 For example, damage is caused by a puncture wound caused by a sabre-toothed tiger.
4 If the spell allows no saving throw, use the save DC it would have if it did allow a save.
Action: None. Making a Concentration check does not take an action; it is either a free action when attempted reactively or part of another action when attempted actively.
Try Again: A Concentration check may be tried again, though a success does not cancel the effect of a previous failure, such as the loss of a spell you were casting or the disruption of a spell on which you were concentrating.
Special: You can use Concentration to cast a spell, use a spell-like ability or use a skill defensively so as to avoid attacks of opportunity altogether. This does not apply to other actions that might provoke attacks of opportunity. The DC of the check is 15 plus the spell’s PP cost, if casting a spell or using a spell-like ability defensively. If the Concentration check succeeds, you may attempt the action normally without provoking any attacks of opportunity. A successful Concentration check still does not allow you to take 10 on another check if you are in a stressful situation; you must make the check normally. If the Concentration check fails, the related action also automatically fails (with any appropriate ramifications) and the action is wasted, just as if your concentration was disrupted by a distraction.