Changes

If , while trying to cast a spell , you take damage, you must make a [[SRD:Concentration Skill|Concentration]] check ([[SRD:DC|DC]] 10 + points of damage taken + the level of the spell you’re casting). If you fail the check, you lose the spell without effect. The interrupting event strikes during spellcasting if it comes between when you start and when you complete a spell (for a spell with a casting time of 1 full [[SRD:Round|round]] or more) or if it comes in response to your casting the spell (such as an [[SRD:Attack Attacks of Opportunity|attack of opportunity]] provoked by the spell or a contingent attack, such as a readied action).

If you are taking continuous damage , half the damage is considered to take place while you are casting a spell. You must make a [[SRD:Concentration Skill|Concentration]] check ([[SRD:DC|DC]] 10 + 1/2 ½ the damage that the continuous source last dealt + the level of the spell you’re casting). If the last damage dealt was the last damage that the effect could deal , then the damage is over, and it does not distract you.