Concentration

Concentration (CON)

You are particularly good at focusing your mind.

Check: You can make a Concentration check to cast a spell despite distractions, such as taking damage, getting hit by an unfriendly spell, and so on. You can also use this skill to maintain concentration in the face of other distractions or on other things besides spells, such as eavesdropping on a conversation despite distractions from other people.

The table below summarises various types of distractions that cause you to make a Concentration check while casting a spell. "Spell Level" refers to the level of the spell you're trying to cast. (See Concentration, page 151, for more information).

DC	Distraction
10 + damage dealt + spell level	Damage or failed saving throw during the casting of a spell (for spells with a casting time of 1 full round or more) or damage 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). (See Distracting Spellcasters, page 134.)
10 + half of continuous damage last dealt + spell level	Suffering continuous damage (such as from Melf's Acid Arrow}
10 + damage dealt + spell level	Damaged by spell
Distracting spell's save DC + spell level	Distracted by non-damaging 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
10 + spell level	Weather is wind-driven hail, dust or debris.
Distracting spell's save DC + spell level	Weather caused by spell, such as Storm of Vengeance (same as distracted by non-damaging spell).
15 + spell level	Casting defensively (so as not to provoke attacks of opportunity).
15	Caster entangled by Animate Rope spell, Command Plants spell, Control Plants spell, Entangle spell, Snare spell, net or tanglefoot bag.

Retry: Yes, though a success doesn't cancel the defects of a previous failure, which almost always is the loss of the spell being cast or the disruption of a spell being concentrated on.

Special: A character with the Combat Casting feat gains a +4 bonus to Concentration checks made to cast a spell while on the defensive (see page 125).