Concentration
Concentration (CON)
Check: The character can use this skill to maintain concentration in the face of other distractions.
The table below summarizes various types of distractions that cause the character to make a Concentration check while casting a spell. "Spell level" refers to the level of the spell the character is trying to cast.
| DC | Distraction |
| 10 + damage dealt + spell level | Injury or failed saving throw during thecasting of a spell (for spells with a casting time of 1 full round or more) or injury by an attack of opportunity or readied attack made in response to the spell being cast (for spells with a casting time of 1 action). |
| 10 + half of continous damage + spell level | Suffering automatic continuous damage |
| 10 + damage dealt + spell level | Damaged by spell. |
| Distracting spell's save DC + spell level | Distracted by nondamaging spell. (If the spell allows no save, use the save DC it would have if it did allow a save.) |
| 20 + spell level | Grappling or pinned. (Can only cast spells without somatic components and whose material component is in hand.) |
| 10 + spell level | Vigorous motion (on a moving mount, bouncy wagon ride, small boat in rough water, belowdecks in a storm-tossed ship). |
| 15 + spell level | Violent motion (galloping horse, very rough wagon ride, small boat in rapids, on deck of storm-tossed ship). |
| 20 + spell level | Affected by earthquake spell. |
| 5 + spell level | Weather is a high wind carrying blinding rain or sleet. |
| Distracting spell's save DC + spell level | Weather caused by spell, such as storm of vengeance (same as distracted by nondamaging spell). |
| 15 + spell level | Casting defensively (so as not to provoke attacks of opportunity). |
| 15 | Caster entangled. |
Special: A character with the Combat Casting feat gets a +4 bonus to Concentration checks made to cast a spell while on the defensive.
Retry: Yes, though a success doesn't cancel the effects of a previous failure.