Shielded Caster

Shielded Caster (Teamwork)
Your allies cover you while you cast complicated spells.
Benefit: Whenever you are adjacent to an ally, you receive a +4 competence bonus on caster checks. If your ally is wielding a buckler or a light shield, this bonus increases by +1. If your ally is wielding a heavy shield or a tower shield, this bonus increases by +2. Finally, if an enemy threatening you and your ally has the Disruptive feat, or another ability that increases the DC of caster checks, the amount of the increase is halved.

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