| Ancient Basilisk | | 6 | 5 | 5 | Path of the Serpent | 1 | The Ancient Basilisk's massive size is the least of its prey's worries. This serpent is uncannily clever and carries a venom so dangerous it almost certainly leads to death. |
| Byakhee | Flying - This monster can move through impassible borders. | 4 | 3 | 2 | Suppressed Memories (Forbidden Alchemy) | 2 | With membranous wings and flat webbed feet, this creature flaps and flops along awkwardly on the ground, but with sinister grace in the air. |
| Child of Dagon | | 4 | 3 | 2 | Base Game | 1 | Even less human than its fellows, this creature's fish-like stare and clammy skin hint at its ancestry. |
| Child of the Goat | | 3 | 1 | 2 | Suppressed Memories (Call of the Wild) | 2 | To all appearances, the Children of the Goat are ordinary people. It is in their appetites and devotion that the aberration lies. |
| Crawling One | | 2 | 4 | 4 | Suppressed Memories (Forbidden Alchemy) | 2 | Huge and hulking, this worm-like creature writhes slowly forward, eating everything in its path. |
| Cthonian | | 4 | 7 | 5 | Recurring Nightmares | 2 | The movement of these great worms beneath the earth causes the ground to shake and buildings to collapse. |
| Cult Leader | | 4 | 3 | 2 | Recurring Nightmares | 2 | As fanatical devotion to unnatural beings grows, so too does mystic power. |
| Cultist | | 3 | 1 | 2 | Base Game | 6 | Some ordinary people devote themselves to extraordinary causes. Some for good, and others...not. |
| Dark Druid | | 3 | 2 | 2 | Suppressed Memories (Call of the Wild) | 2 | Clad in dark robes, these pagan priests are mortal men driven to unnatural practices. |
| Dark Young | | 4 | 7 | 5 | Suppressed Memories (Call of the Wild) | 1 | It seems as a tree, an enormous bulk with branches of writhing tentacles, all drawing prey into its hungry mouths. |
| Deep One | Aquatic - This monster can move through impassible borders that represent water. | 3 | 4 | 2 | Base Game | 4 | It is some terrible and powerful fusion of fish and human being. Croaking, hopping, with deadly teeth and claws. |
| Deep One Hybrid | | 3 | 1 | 2 | Base Game | 4 | At first glance, he seems to be a human being, but the creature conceals a corrupt secret within its blood. |
| Dimensional Shambler | Phasing - This monster can move through impassible borders and walls. | 4 | 5 | 2 | Horrific Journeys | 2 | Dimensional Shamblers tear down the thin walls of reality in search of prey to drag back to their home dimensions. |
| Dunwich Horror | | 7 | 9 | 5 | Suppressed Memories (Call of the Wild) | 1 | The most horrifying thing about this massive, amorphous, many-limbed monstrosity is the half-human face that moans atop it. |
| Feathered Serpent | Flying - This monster can move through impassible borders. | 3 | 2 | 2 | Path of the Serpent | 1 | The brightly colored feathered serpent stalks its prey as easily among the trees as it does along the ground. |
| Formless Spawn | | 4 | 6 | 4 | Horrific Journeys | 1 | Viscous and shifting, the Formless Spawn takes on whatever features best serve its master's will. |
| Goat Spawn | | 4 | 3 | 2 | Suppressed Memories (Call of the Wild) | 2 | This creature is an unholy fusion of human and monster, with horns and other bestial features. It possesses an animal's strength, as well. |
| Ghost | Phasing - This monster can move through impassible borders and walls. | 2 | 5 | 1 | Base Game | 2 | Flickering and unreal, ghosts are spirits of the departed, drifting through the world of the living. |
| Hired Gun | | 2 | 1 | 2 | Streets of Arkham | 2 | When financial gain is the most important factor in moral decisions, ordinary men become the worst sort of monster. |
| Hound of Tindalos | Phasing - This monster can move through impassible borders and walls. | 6 | 5 | 3 | Recurring Nightmares | 2 | This creature flickers and is gone so quickly that it is impossible to say what it looks like. It seems to move outside of time and space. |
| Hunting Deep One | Aquatic - This monster can move through impassible borders that represent water. | 4 | 5 | 4 | Horrific Journeys | 2 | The Hunting Deep One's bulky frame aids its pursuit of those who stray too closely to their underwater realms. |
| Hunting Horror | Flying - This monster can move through impassible borders. | 5 | 6 | 3 | Base Game | 2 | Black, and ropy, and relentless, the creature flies swiftly, always seeking its quarry. Its ever-changing form is hard to see for mortal eyes. |
| Lloigor | | 7 | 9 | 5 | Streets of Arkham | 1 | The Lloigor's reptilian form is a psychic illusion, brought on by its slow feeding on human minds. But when its claws tear into flesh the illusion feels all too real. |
| Maniac | Unstoppable - This monster converts all Clues to Stars while attempting to destroy a barricade. | 5 | 1 | 2 | Recurring Nightmares | 2 | Not everyone can witness the horrors of the true world and retain their sanity. |
| Mi-Go | Flying - This monster can move through impassible borders. | 6 | 4 | 3 | Recurring Nightmares | 2 | The thing's crustacean-like body has sets of paired appendages and thin, fluttering wings, and it is topped with a mass of antenna in place of a head. |
| Nightgaunt | Flying - This monster can move through impassible borders. | 6 | 5 | 3 | Suppressed Memories (Call of the Wild) | 2 | This faceless, winged creature has rubbery skin and a barbed tail. Its strange, keening cry is unsettling. |
| Priest of Dagon | | 4 | 3 | 2 | Base Game | 1 | Dedicated to a monstrous divinity, the Priest of Dagon celebrates the union of man and undersea monster. |
| Riot | | 7 | 4 | 4 | Base Game | 2 | Ordinary people in large numbers can be extremely dangerous. Unfortunately, they are usually dangerous to one another. |
| Serpent Person | | 4 | 3 | 3 | Path of the Serpent | 3 | The Serpent People have never forgotten the splendor of their once-great civilization and will reclaim their lost legacy at any cost. |
| Shoggoth | | 3 | 6 | 4 | Recurring Nightmares | 2 | A mass of protoplasmic flesh, self-luminous, covered with an ever-shifting array of eyes, appendages, and organs. It flows forward as slowly and inevitably as a glacier. |
| Skeleton | Aquatic - This monster can move through impassible borders that represent water. | 2 | 4 | 2 | Streets of Arkham | 2 | Creaking and cracking, the bones that lay still for ages now roam at the command of dark forces. |
| Star Spawn | Flying - This monster can move through impassible borders. | 5 | 8 | 5 | Base Game | 2 | Huge and alien, this creature's rubbery skin and tentacled mouth hint at an undersea ancestry, but its wings and claws suggest something much worse. |
| Star Vampire | Phasing - This monster can move through impassible borders and walls. | 4 | 6 | 3 | Streets of Arkham | 2 | The blood the Star Vampire feasts on will temporarily color its limbs, making the beast visible until it is ready to hunt again. |
| Temple Guardian | Unstoppable - This monster converts all Clues to Stars while attempting to destroy a barricade. | 4 | 4 | 5 | Path of the Serpent | 2 | Among crumbling walls, Temple Guardians still keep their eternal watch. |
| Thrall | | 3 | 4 | 2 | Beyond the Threshold | 4 | With control of this body passed to a greater power, the will of this creature is as alien and terrifying as its form has become. |
| Witch | | 3 | 2 | 2 | Recurring Nightmares | 2 | From the outside, there is no trace of evidence that this being has made a pact with infernal powers. True corruption must lie within. |
| Wizard | | 4 | 3 | 2 | Suppressed Memories (Call of the Wild) | 1 | There have always been stories of ordinary men and women who, through study or eldritch pacts with demons, wield great mystical power. Tragically, these stories are true. |
| Warlock | | 3 | 3 | 2 | Horrific Journeys | 2 | Knowledgeable in both the latest fashions and the oldest spellcraft, Warlocks are the dangerous result of combining mere mortals with devastating powers. |
| Wraith | Phasing - This monster can move through impassible borders and walls. | 2 | 6 | 1 | Sanctum of Twilight | 2 | Wraiths prowl the mortal world, restless in death. Primal rage and pain twist them into spectral predators who seek terror and violence. |
| Zombie | | 2 | 4 | 2 | Recurring Nightmares | 4 | A shambling corpse that was once a human being, the Zombie possesses impossible strength but only a shred of its former speed and grace. |