I got the idea after watching the episode “Castle Mane-ia” which kinda involved his legend and well…I think he’ll be an interesting villain, probably give him a background in my comic(just thought of his backstory easy~). Anyway the basics, he cannot talk so he communicates by summoning one of his “shadows” to do it for him. He can have any form/limbs so the alicorn form is a sample of one. Lastly he has an offspring known as Dawn and also they both are genderless and technically they can produce a physical form but it’s…well this right here which explains why the shadow is the only one that’s all…that.

MlpFim (c)
Concept of The Pony of Shadows/Dawn (c)