Elemental Bending

You choose one element (Fire, Water (+Ice), Earth, Air (+Lightning) ) and use up all the spell slots available to you of the level at which this spell was cast and lower (at least one per spell level), making all the power of the chosen element available to you for the time. This means that you can use all the effects of the spells (from your spell list) of the level at which this spell was cast and lower, related to the chosen element, without using spell slots for it. Use the values of the corresponding spells for the duration and time needed for the effects. If you cast a cantrip related to the selected element, you can cast it as a reaction (after any action) or bonus action.