Dark Chair

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The Dark appears to be a black shiny chair that usually found in abandoned homes and businesses in [usually found on abandoned planets generally as well] but in actuality is a parasite from the cross dimension.

Generally what happens is someone sits in the chair and is quickly encased by the parasite and then using the mental energy of its victim [which if the person is an esper of any kind the parasite becomes very powerful] and slowly spreads tentacles of itself outward from the site [generally from underground] and any creature that it comes across [insect, animal, humanoid] and encases them as well and then releases them to use as scouts to find more victims, eventually dark chairs are able to take over entire worlds and if the civilization is advanced enough they’ll send out scouts via space travel and conquor other planets [thankfully only one such chair has done so in the Veritas Nebula].