Combat Casting

The material below is Open Game Content from a 3PP Source

Combat Casting
You are adept at spellcasting when threatened or distracted.
Benefit: You get a +4 bonus on concentration checks made to cast a spell or use a spell-like ability when casting on the defensive or while grappled.

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The material below is Open Game Content from the System Reference Document.

COMBAT CASTING [GENERAL]
Benefit: You get a +4 bonus on Concentration checks made to cast a spell or use a spell-like ability while on the defensive or while you are grappling or pinned.