Your base walking speed is 30 feet, Fly at 90ft

Thanks to your mysterious heritage, you have superior vision in dark and dim conditions. You can see in dim light within 90 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

Shapechanger. The doppelganger can use its action to polymorph into a Small or Medium humanoid it has seen, or back into its true form. Its statistics, other than its size, are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Ambusher. The doppelganger has advantage on attack rolls against any creature it has surprised.

Surprise Attack. If the doppelganger surprises a creature and hits it with an attack during the first round of combat, the target takes an extra 10 (3d6) damage from the attack.

You can speak, read, and write Common and Auran.

Air Form Creature: As an Air Form creature Auranthorpe's can enter a Hostile creature's space and stop there. It can use its Action to move through a space as narrow as 1 inch wide without squeezing. 

Create Form: You can change your form to any object you have seen. In this state you cannot Attack (unless shaped as a weapon) and adopt the Statistics of the Object. It takes one Action to change Forms for simple objects and two Actions for complex Forms. The complexity is at the discretion of the GM. 

Elemental Magic: Your innate magic comes from Elemental magic that was mingled with your blood or that of your ancestors. Most often, sorcerers with this origin trace their descent back to a mighty Djinn of ancient times or who might even have claimed a Elemental parent. Some of these bloodlines are well established in the world, but most are obscure. Any given Sorcerer could be the first of a new bloodline, as a result of a pact or some other exceptional circumstance.

Bottled Respite: At 1st level, you can use one action to magically vanish and enter your vessel, which remains in the space you left. The interior of the vessel is an extra-dimensional space in the shape of a 20-foot-radius cylinder, 20 feet high. The interior is comfortably appointed with cushions and low tables and is a comfortable temperature. While inside, you can hear the area around your vessel as if you were in its space. You can remain inside the vessel up to a number of hours equal to twice your proficiency bonus. You exit the vessel early if you use a bonus action to leave, if you die, or if the vessel is destroyed. ( The vessel’s AC equals your spell save DC. Its hit points equal your warlock level plus your proficiency bonus, and it is immune to poison and psychic damage. If the vessel is destroyed or you lose it, you can perform a 1-hour ceremony to receive a replacement from your patron. This ceremony can be performed during a short or long rest, and the previous vessel is destroyed if it still exists. The vessel vanishes in a flare of elemental power when you die.) When you exit the vessel, you appear in the unoccupied space closest to it. Any objects left in the vessel remain there until carried out, and if the vessel is destroyed, every object stored there harmlessly appears in the unoccupied spaces closest to the vessel’s former space. Once you enter the vessel, you can’t enter again until you finish a long rest.

Compelled: At 3rd level you gain the Wish Spell and are compelled to grant the Wishes of others when capable. 

Deity Deception: At 7th level you can channel the dreaded presence of your ancestors, causing those around you to become awestruck or frightened. As an Action you can draw on this power to exude an aura of Awe or Fear (Your Choice) by increasing your size to 80ft. For 1 Minute , or until you lose Concentration, each hostile creature that starts its turn in its aura must succeed on a  Wisdom saving throw or become Charmed until the Aura ends. A creature that Succeeds the saving throw is immune to your Aura for 24 hours.

Elemental Demise: At 10th level, if you are killed you evaporate into an arcane fog before returning trapped in a magical object.

As a Auranthorpe you Gain +2 to Dexterity and Charisma.

Auranthorpe mature at the same rate as humans but live many years longer. It is unknown exactly how long their lifespan is, but it is thought that they may live as long as Djinn. 

Auranthorpe might not have an innate tendency toward evil, but many of them end up there. Evil or not, an independent nature inclines many toward a chaotic alignment.

When exposed to Fire, Cold, or Silver Weapon Attacks you take an additional 1d6 damage.

Freeze: If the elemental takes cold damage in Air Form, it partially freezes; its speed is reduced by 20 ft. until the end of its next turn.

Auranthorpe are about the same size and build as humans typically; however, they are able to shape change into larger creatures. Your size is Large.