Arcane Shield Training
Prerequisites: Shield Proficiency
Benefit: When using a shield other than a tower shield you may take a swift action to decrease your channel of spell failure due to the shield by 10%.  Additionally your shield had is considered free for the purpose of casting spells, but not delivering touch spells.  However a magus spell combat ability cannot be used while they wield a shield in this manner.
Normal: Shields cause arcane spell failure.