Rifters

Rifters are being that use the Delta State to their adventage. They can store acache's there for 48 hours so they can be fully aquired. They are seen as the enemies.

Biology
Rifters have a very long lifespan, but there is no confirmation how old a rifter can become. Animals cannot go near them and will try to escape, if the animals can't escape they will die. The Delta state seems to be healthy for them. They apperantly have energy fields that can be detected as the area they are in are usually charged with static elecelctricty after they left.

Psychology
Rifters are known for their lack of emotion as they are often lectured by other rifters if they show emotions, claiming that they seem human. This may show how they beleive they are supperior to humans, though not all rifters hold this beleif and it's been shown that rifters are capable of emotions.

Abilities
Rifters have a range of abilities, for example some can disguise themselves and even make their voices sound different, they can use energy to erase people even if they are not in the Delta state, they can also aquire people's minds, essentially taking over them.