However, this proxy form was rendered useless and inert after the new Gate was shut, and the psychic link disabled once again. This biomass was then combined to create a proxy form, through which Vecna could directly act in the human world like the Mind Flayer, this proxy form also resembled a spider, and had the same flame-shaped head. Via this piece, Vecna began kidnapping and possessing multiple humans and rats, feeding them chemicals and melting their bodies into puddles of biomass. The isolated piece of the Mind Flayer remained dormant at Brimborn Steel Works until 1985, when a newly opened Gate reestablished the psychic link to Vecna. As Eleven closed the Gate, Will's friends and family worked to force a piece of the Mind Flayer out of his body, which in turn became dormant after the Gate's closure. Eleven interfered by closing the interdimensional gate she previously opened at Hawkins Lab, severing the psychic link between the worlds and killing the Demodogs in the process. Acting through the Mind Flayer, he possessed Will Byers and an army of adolescent Demogorgons, or 'Demodogs'. Henry, also known as Vecna, first actively attempted to take over the world in 1984. Henry used his powers to reconstitute the mist into a form that satisfied him: a giant, spider-like entity with a flame-shaped head, not unlike a similar creature he had fantasized about and illustrated as a child. This version of the Mind Flayer was a storm-like mass of shadowy particles, or mist it is not known if the mist possessed its own independent will, or consciousness. The earliest form of the Mind Flayer was discovered by Henry Creel between 19, following Henry's banishment to the Upside Down. In a sense, the entirety of the Upside Down was like one gigantic organism, with all its contents and agents connected both physically and mentally via the Mind Flayer. The Mind Flayer could wield supreme control of the Upside Down via a psychic link, with Demogorgons, vines, and demobats forming a shared hive mind for a period in 1985, possessed humans known as 'The Flayed' would also comprise part of the hive mind. The Mind Flayer is gigantic, looming at least 50 stories tall, and sports a distinctive spider-like appearance. The Mind Flayer is an entity originating from the Upside Down, an alternate dimension existing in parallel to the human world.

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