Prerequisite: The ability to cast spells using spell slots
You learn how to amplify spells for later use. Whenever you finish a long rest, you can allocate any number of your spell slots to your spells. To allocate a spell slot, choose one known or prepared spell to occupy it with a level less then or equal to the slot's level. The spell slot can't be used for anything else other then casting its occupied spell, but when you do so, the spell's level is treated as being one level higher then the spell slot used. You can choose to allocate any number of spell slots you regain throughout the day.
When you finish another long rest, all unused allocated spell slots no longer are allocated, unless you choose to allocate them again.
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