Arcane Surge (Su)

As a swift action, you can expend one use of mythic power to cast any one arcane spell without expending a prepared spell or spell slot. If you prepare spells, this spell must be one you prepared today (even if you have already cast it); if you’re a spontaneous caster, this spell must be one of your spells known. If the spell requires a saving throw, any non-mythic creatures affected by the spell roll twice and take the lower result. If you must attempt a caster level check for the spell to overcome a creature’s spell resistance, you can roll your caster level check twice (adding your tier to each) and take the higher result. You can’t add a metamagic feat to a spell you cast using this ability.