PhantoDemons

PhantoDemons are the same race as Nightmare, and were first found by K.J March and also given a Shadow Realm by K.J March and his XenoDrones.

Powers and Abilities:

PhantoDemons can possess living beings and control their thoughts, similiar to that of a Ectonurite. With scary powers, they have mastery over creating Force Feilds, Shadow Manipulation, Flight, Intangebility, and limited Telepathy on sentient and non-sentient beings. Some also can use sharp claws, because several claw marks were seen on K.J March's deceased body.

Weaknesses:

Being creatures of pure Darkness,similiar to an Ectonurite, any form or amount of light can make them feel undescribable pain. It was also stated by K.J March that they can be affected by Magnetic Pulses, but nobody has ever proved this theory.

Trivia:
 * K.J March found these Aliens on his exploration around half the galaxy.
 * Technically, their DNA couldn't have ever been put in Omnitrix without K.J March, because his body had traces of PhantoDemon DNA surrounding his beaten body. 
 * Even Azmuth wasn't aware of their Existance in the Universe until K.J March was found.