You focus your power inside, making it your own. As it builds within you, you become less and less like a mortal creature and more and more like an elemental. Eventually, you come to embody the elements entirely, becoming a true elemental, no longer bound by the limits of flesh.
At 3rd level, become adapted to living within your element. You gain a bonus adaptation chosen from below, matching your 1st level Elemental Affinity choice. This choice is hereafter referred to as “your element”
Also at 3rd level, you begin to find that controlling the elements takes nearly no effort at all. You are able to use your command elements ability as a bonus action.
At 7th level, you learn how to temporarily take on the form of an elemental. You can cast polymorph on yourself without expending any spell points, except only to turn into an air, earth, fire, or water elemental, matching your element. Once you use this ability, you must complete a long rest before you can use it again. While transformed this way, you can only cast spells matching the element whose form you have taken, and you can use your elemental blast and command elements abilities. At 15th level, you can instead turn into a giant air, earth, fire, or water elemental.
At 11th level, your body begins to become more elemental and less flesh. You gain immunity to the poisoned condition and to disease. Additionally, you gain one of the following abilities, matching your element, even if you don’t meet its prerequisites.
At 15th level, your type changes to elemental, your path of transcendence has reached its apex, and you have shed your mortal form. You take on the form of an elemental, becoming made of solid air, earth, fire, water, as appropriate for your element. You no longer need to breathe, drink, eat, or sleep, no longer requiring Supply. Additionally, you gain an additional ability based on your element.