Pathfinder 1e

Concentration & Defensive Casting

Pick the casting interruption and get the right DC rule immediately.

START WITH THE SITUATION

What is disrupting the spell?

Casting defensively

Avoid the attack of opportunity.

  1. Concentration DC = 15 + twice the spell level.

  2. Roll d20 + caster level + casting ability modifier + applicable bonuses.

  3. Failure loses the spell; success permits the casting without provoking from casting.

Check the source rule ↗
Sources & scope

Independent play aids. Calculations use your inputs; specific abilities and the GM’s ruling can change the result. Each tool links to its reference. Rules were checked September 2026.

Reference reading: SRD 5.1 · SRD 5.2.1 · Pathfinder 1e rules · Pathfinder 2e rules · Daggerheart SRD · Call of Cthulhu rules. These are independent resources and are not publisher-endorsed.