Archon

The aliens that put a soul net over earth that keeps people in a eternal state of reincarnation and spread death, war, and tortures spiritually strong people to spiritually lower the population so they can use humans as a food source to live thousands of years.

The archon infected josh with a tadpole implant and electrocuted his brain every time he tried to learn.

Shrout

The white substance the cornergrowth and severed offspring create.

Sigma was deemed threatening to the cell so the cornergrowth wormed inside him and assimilated him with Shrout.