Elemental Fusion

With this spell you change your shape into that of an elemental hybrid. You must complete a ritual in preparation for casting this spell. During this ritual you must succeed on an Intelligence (Arcana) check, a Wisdom saving throw and a Constitution saving throw against a DC of 20. If you fail one, reroll it against a DC of 23. The spell and materials are lost if you fail more than one. If the ritual succeeds, the Elemental Gems merge together into one crystal. When you cast the spell, at a time of your choosing, the gem is consumed and you transform into an elemental hybrid of air, earth, fire and water for the duration or until you use a bonus action to end it early.

This spell is so taxing on your mind and body that you become exhausted for 24 hours or until you take a long rest. Make a Constitution saving throw. On a succes your exhaustion level becomes 4, on a fail it becomes 5.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the level of exhaustion and DC decrease by 1 for each slot level above 6th.