Spell Manipulator

You can cast your spells as 1 level higher but consuming the ordinary slot of the level the belong to, this may be done times per day up to your Spellcasting ability bonus. 

Also once per day you can spend 10 minutes and use one of your spell slots to restore a consumed spell slots of 1 level higher. You must roll a Saving throw of your Spellcasting ability (INT for Wizards, Wisdom for Cleric and so on) with a DC that is equal 12 + the level of the spell slot you are trying to restore (if you are a Sorcerer and you are restoring a 4th level slot you roll a DC 16 Charisma saving throw), on a fail the lower level spell slot is consumed and you lose the the higher level spell slot until your next level up, and gain one extra slot of the lower level instead.