The Corruption (also known as Filth and The Crawling Rot) is one of the Entities. It is linked closely to our feelings of disgust, of feeling revulsion and fear of corruption, disease, filth, and manifests as mould, bugs, rot, decay, infection. The feeling of your skin crawling.
It also has a particular connection to themes of love and companionship. Several of its victims find a comfort in its manifestations, growing fond of company others find vile.
- MAG 6: Squirm
- MAG 22: Colony
- Jane Prentiss
- MAG 26: A Distortion
- Partially; The Flesh Hive
- MAG 32: Hive
- Jane Prentiss
- MAG 36: Taken Ill
- MAG 39: Infestation
- MAG 40: Human Remains
- MAG 45: Blood Bag
- MAG 55: Pest Control
- John Amherst, Jane Prentiss
- MAG 68: The Tale of a Field Hospital
- John Amherst
- MAG 84: Possessive
- Old Maggie
- MAG 93: Contaminant
- The purple mold
- MAG 102: Nesting Instinct
- The little beetle
- MAG 153: Love Bombing
- Agape, Divine Chains
- MAG 157: Rotten Core
- John Amherst
- Agape: An emaciated dog that compelled obsessive, incredible love.
- Divine Chains: An American cult co-opted by Agape's influence over its leader.
- The Flesh Hive: Also known simply as The Hive, the Flesh Hive is a symbiotic entity. The first component is a swarm of silvery worms with black heads, while the second is a human host. The worms typically attack and consume humans, whether immediately through sheer numbers or by infecting them and multiplying until they can devour them from the inside out in one gory burst. However, if a human is predisposed to The Corruption's influence, they can instead become a host. It is unclear to what extent the Flesh Hives are the Corruption essentially possessing its human hosts and taking over their bodies, and to what extent they are humans who have become Avatars.
- Jane Prentiss: The primary Flesh Hive shown. She was the first known host, as the Flesh Hive originated from a mass of The Corruption growing in her attic.
- Timothy Hodge: A man who slept with a woman with a dormant Flesh Hive infection, shortly before it consumed her. He was encountered two years later by Sasha James, by which point he seemed to be becoming a Flesh Hive himself.
- John Amherst: An avatar of the Corruption who first appears in MAG 36. While he is associated with insects, particularly flies and ants, he is primarily aligned with disease and plague.
- The Little Beetle: A thing with many children. It entrances those desperate for companionship, gradually infecting them as they love it.
- Old Maggie: A recluse in the village of Cratfield, whose yard served as a dump for the townsfolk. Her groceries were delivered by a local child. She never ate these groceries, merely adding them to the piles of refuse in the yard, and this child eventually took her place as the dump's owner.
- A strain of purple, spongy mold that grows in drains and, eventually, in people.
- A Journal of the Plague Year: A variation of A Journal of the Plague Year that causes structures to rot apart.
- The Tale of a Field Hospital: A variation of The Tale of a Field Hospital that contains passages about John Amherst. Its pages are sharp and eager to inflict papercuts, which rapidly become infected and rotten.
- A plague-infected scalpel that cannot be disinfected.
- A 19th century syringe with unusual effects on mosquitoes. Given the context of the related statement, wherein unusual events happen only after its sale, it may actually be a ward of some kind against the Corruption's influence.
The Corruption has no known named rituals, though presumably Smirke created one when he wrote rituals for each Entity.
Jonathan Sims theorized that Jane Prentiss was attempting to begin a ritual in 2016. The ritual involved the creation of a gate with the worms of the flesh hive in an area saturated with its influence, intended to rot a hole into The Corruption itself. Her attack on The Magnus Institute in MAG 39: Infestation may have been meant to fuel the ritual with the destruction of a rival Power's stronghold. This ritual was preemptively ended with the death of Jane Prentiss and the flesh hive.