Your Size is Medium (about 4-7 feet tall) or Small (about 2-4 feet tall), chosen when you select this species.

You are an Elemental.

Your Speed is 30 feet.

Your body has been magically sliced in half horizontally at the midsection, a ghostly tether holding the two halves together. The areas in your body that have been cut in half acts as a portal. This portal cannot be seen through, it is instead a constant, opaque picture of the stars, swirling and changing. Whenever something is sent through one of the midsection portals, it instantly gets sent out the other, ending up in an unoccupied space within 5 feet of the portal. Creatures that are Medium or smaller can traverse through the portal.

Your halves can separate from each other, your upper half having a flight speed equal to your walking speed instead of having the ability to walk. While both halves are split in this way, the lower half cannot benefit from healing. In addition, auras, such as the Paladin's Aura of Protection, can only affect you if both halves are within its range. Your halves cannot move more than 30 feet from each other. If one half is shunted or teleported to an area outside this range, the other half is sent within 30 feet of the moved half parallel to its original position.

The unpredictable portal magic residing within you causes you to have an innate ability for teleportation. You learn the spell Vortex Warp at 2nd level. You always have this spell prepared. You can cast it once without a spell slot, and you regain the ability to cast it in that way when you finish a Long Rest. You can also cast the spell using any spell slots you have of the appropriate level.  

Intelligence, Wisdom, or Charisma is your spellcasting ability for when you cast with this trait. (choose the ability when you first select the species.)