As a bonus action on your turn you can change what form you are and gain immunity to whatever damage type is associated with whatever form you are in and you gain advantage on stealth checks to hide when in the associated element; Water form: (~6 feet tall) when in water form your movement speed increases by 10 feet and you can meditate for an hour and you and up to four other players or creatures of your choice within 50 feet of you at the end of the meditation regain 1d8 hit points (this increases to 2d8 at 5th level and to 3d8 at 12th level), Earth form:(~9 feet tall) when in earth form your movement speed decreases to 25 feet and you gain resistance to bludgeoning, slashing, and piercing damage and your attacks deal 1d6 extra damage of whatever damage type the weapon you are wielding does (this extra damage increases to 2d6 at 7th level and to 3d6 at 14th level), Fire form:(~7-8 feet tall) when you are in fire form your movement speed increases by 10 feet and you can shoot fireballs (Ranged weapon attack 2d6 damage on a hit; range 30/60), Air form:(~7-8 feet tall) when in air form your movement speed doubles and you gain advantage on slight of hand checks as well as Dex saving throws. You also get +3 to stealth checks in addition to the general Racial bonus when in the corresponding element. But to regular stealth checks you just get advantage.

+2 Constitution, +1 Strength, +1 Dexterity