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Message: <blockquote data-quote="airwalkrr" data-source="post: 2784323" data-attributes="member: 12460">This ability should definitely require a feat. I suggest the following feat.Instant CognitionPrerequisites: Spell Mastery, ability to prepare spellsBenefit: You may leave one or more spell slots open for the the ability to instantly memorize a spell later. This effectively allows you to spontaneously cast a small number of spells using the open spell slot. You may only cast spells that you know with Spell Mastery this way, and the open spell slot must be at least one level higher than the spell that is spontaneously cast. For example, Mialee has left a 4th-level spell slot open. Among the spells she knows by virtue of Spell Mastery are magic missile, grease, scorching ray, stinking cloud, and ice storm. She could use that open spell slot at any time to cast magic missile, grease, scorching ray, or stinking cloud, just as if she had prepared it, but not ice storm. Use of this ability is a swift action.Normal: It takes at least 15 minutes to memorize a new spell to fill an empty spell slot.</blockquote>