Casting a Quickened Spell is a free action. You can perform another action, even casting another spell, in the same round as you cast a Quickened Spell. You may cast only one Quickened Spell per round. A spell whose casting time is more than 1 full-round action cannot be quickened. A Quickened Spell has a spell multiplier of 4. Casting a Quickened Spell doesn’t provoke attacks of opportunity.