Primordial, Stage 1

Air. You have resistance to lightning damage. In addition, you can channel the air currents around you to guide a ranged attack. Once on each of your turns, when you make a ranged weapon or ranged spell attack, you can make that attack with advantage. If you are in a location without an air current, such as underwater, this feature has no effect.
Earth. You have resistance to poison damage. In addition, whenever you gain temporary hit points, you gain that many plus your proficiency bonus instead.
Fire. You have resistance to fire damage. In addition, whenever you deal fire damage, you can add your Constitution modifier to the damage dealt.
Water. You have resistance to cold damage. In addition, whenever a creature regains hit points due to a spell or feature you control, you can imbue them with healing elemental energy. The creature regains additional hit points equal to 1d6 + your Constitution modifier.

Flaw.
Planar Binding. Your body and soul are bound to a primordial plane of existence. You have disadvantage on death saving throws as the plane attempts to pull you back to it. If you would be killed, your soul is taken back to a plane of existence of the GM’s choice. This plane is your new home, and you become an NPC under the GM’s control. If you are on the primordial plane responsible for your transformation, this flaw has no effect.