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 fantasy creature he had imagined 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, though it was certainly a living organism. The entity 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 mentally connected via the Mind Flayer.

The Mind Flayer exercised 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' also comprised part of the hive mind. The entity was gigantic, looming at least fifty stories tall, and sported a distinctive spider-like appearance. This entity had many names, including the Shadow Monster, the particles, and the Mind Flayer.

33 | 34* * = appears via proxy or flashbackĪ mysterious entity, made up entirely of silver-black particles, lived within the alternate dimension known as 'the Upside Down'.

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