Elemental Form

You transform yourself into an elemental. The transformation lasts for the duration,  or until the target drops to 0 hit points or dies. The elemental can be any whose CR is equal to 5 or lower. Your game statistics, except mental ability scores, are replaced by those of the chosen elemental. You also retain your alignment and personality.

You assume the hit points of your new form. When you revert to your normal form, you return the the number of hit points you had before you transformed. If you revert as a result of dropping to 0 hit points, any excess damage carries over to your normal form. As long as the excess damage doesn't reduce you to 0 hit points, you aren't knocked unconscious.

You are limited in the actions you can perform by the nature of your new form. You may speak, but only in languages that your elemental form understands, but you cannot cast spells. Your gear melds into your new form and you cannot activate, use, wield, or otherwise benefit from any of your equipment. 

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the CR of the elemental you choose may be 1 higher for each slot level above 5th.