Perfect Dreamers are creatures that can warp reality to suit their wishes, currently the only ones. There are only 2 of them, a male and a female. They can be born only once per century. If one of them dies, the other one will also die. Due to their powers, Perfect Dreamers are as about mighty as Eternals, even while they aren't formed by Eternya.
There isn't known much about Perfect Dreamers yet, other than the fact that they have gained their powers by absorbing some of the energy of Eternya, making them something like the two halves of Eternyas reincarnation.