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Arcane Spells and Armor

Source PRPG Core Rulebook pg. 83
Armor restricts the complicated gestures required while casting any spell that has a somatic component. The armor and shield descriptions list the arcane spell failure chance for different armors and shields.

If a spell doesn’t have a somatic component, an arcane spellcaster can cast it with no arcane spell failure chance while wearing armor. Such spells can also be cast even if the caster’s hands are bound or he is grappling (although concentration checks still apply normally). The metamagic feat Still Spell allows a spellcaster to prepare or cast a spell without the somatic component at one spell level higher than normal. This also provides a way to cast a spell while wearing armor without risking arcane spell failure.

Archives of Nethys

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Arcane Spells and Armor