Hellish beasts.

HELL DOG:
A creature from the afterlife - it can guard the entrance to it, hunt lost souls, or be a servant of demons.

Appearance:
A huge black dog. Demonic horns on its head. Glowing eyes—red, yellow, or even green. A sulfurous smell. Long claws dragging along the ground. Saliva dripping from its jaws. In the darkness, a reddish or greenish glow swirls around the creature, and in the light it appears pitch black.

Character:
Fierce, merciless, and obsessed with the hunt, they relentlessly pursue their target and are extremely difficult to stop. They are quite cunning and intelligent. They are loyal to their masters—the demons who summoned them. The appearance of such a dog is considered a harbinger of death or misfortune.

Capabilities:
Inhuman strength, speed and endurance - can easily catch up with a person, can move heavy objects.
Heightened senses - hypersensitive sense of smell, hearing and sight, making him an excellent hunter.
Pyrokinesis—in many stories, hellhounds can breathe fire. Sometimes this fire has special properties: it can burn through protective amulets and leave scorched marks.
Phantom entity - in a number of legends they have a "phantom" nature, which helps them penetrate into places where ordinary creatures cannot.
Howling - in some legends, a dog's howl deprives the victim of the will to resist or foretells death.

Weaknesses:

Salt creates an impenetrable barrier: a dog can't cross it (though it can blow it away). A witch's mixture and grave dust have a similar effect.
Supernatural weapons - special artifacts can kill or seriously injure a hellhound: Ruby's Knife, Angel's Blade, Archangel's Sword, Colt.
Iron weapons are capable of inflicting wounds and scaring off the creature.
More powerful creatures are effective against them: archangels, angels, higher demons, God, Death.

They cannot cross even a small amount of water, and when running, they open their mouths, which can be used to throw something inside.

Appearance:
Grotesque and frightening.
A massive, clumsy body with thick skin, sometimes covered with stiff, sharp bristles.
A huge head with a wide snout and pig-like features, but distorted - for example, with unnaturally large, crooked or jagged fangs.
The eyes are blood-red, glowing with a frightening, “empty” look.
Smoke from the mouth, strange marks on the skin, unnaturally long claws.

Character:
Demonic boars are the embodiment of blind, unbridled aggression and chaos.
Reckless rage. They do not retreat, even if the opponent is stronger, and may attack without apparent provocation.
Gluttony and cruelty. These creatures are not above devouring not only flesh, but also armor, runes, and other material objects.
The trick is in hunting. They try to catch their prey off guard rather than engage in open combat.
Connection to dark magic or a curse. An embodiment of evil, the result of a curse, demonic possession, or the consequence of human vices.

Capabilities:
In addition to physical strength, such creatures are often credited with special abilities:
Toxicity. The bristles and saliva are poisonous—contact with them can poison and even kill.
Reckless, destructive nature.

Weaknesses:
Vulnerability to certain types of weapons. Can only be damaged by magical weapons, silver blades, or special artifacts.
Dependence on the source of power. If the boar is the result of a curse, ritual, or demonic possession, then destroying the source (the cursed object, performing an exorcism) can weaken or destroy it.
Weakness in certain conditions. They lose strength in liminal (border) spaces—for example, at the border between a forest and a field, or near water.
Emotional triggers. Sometimes they can be outsmarted by playing on greed, blind rage, or other personality traits.

Apop:

Appearance:
A huge serpent. Its length reaches 120 cubits—approximately 63 meters. Its body is covered in rings of scales, and its mouth is open and filled with sharp teeth.

Character:
The embodiment of the forces of chaos, darkness, and destruction. He represents everything that opposes order (Maat), upheld by the sun god Ra. Apophis harbors a deep, fundamental enmity toward Ra: he hates the very existence of light and seeks to plunge the world into eternal night. His goal is to devour Ra's solar barge, drink the waters of the subterranean Nile, and thus block the god's path, thereby destroying the cosmic balance.

Capabilities:
Distortion of reality and control over chaos.
Elemental Manipulation: He can cause earthquakes, storms, control darkness, and other elements (earth, water, sand, even electricity).
Change of shape and size, ability to stretch over huge distances.
Venomous Bite: Any soul it absorbs ceases to exist.
Possession of the "Eye of Evil" - an artifact that can plunge people and gods into a stupor.
Near-invulnerability and regeneration: He cannot be truly killed, but can be temporarily stopped; however, it takes him time (for example, a whole day) to recover from injury.

Weaknesses:
Apop's main weakness is that he is not omnipotent. His power is inferior to that of Ra. In myths, they clash every night in the underworld (Duat), and Ra invariably prevails: he slays the serpent, severs its spine, and fire consumes his opponent. After this, Apop is forced to vomit the water he swallowed, and Ra's boat continues its journey.

Special spells (for example, from the "Book of Overcoming Apophis") must be used against him to drive away the serpent and prevent him from completing his mission.

Apophis is a symbol of indomitable chaos, which constantly threatens the world order, but is ultimately defeated by the power of light and order.

Jormungand:

Appearance:
Jörmungandr is a colossal sea serpent. Legend has it that it is so enormous that it wraps around the entire Earth, its tail reaching into its own mouth.
A triple, forked jaw with protruding teeth and two pairs of long fangs (one on the side and one in front of the lower jaw). Coloration is grayish-red with brown hues.

Character:
Jörmungandr is the embodiment of destructive force and the harbinger of Ragnarök (the end of time). He harbors a deep, all-consuming hatred for the gods (especially Thor and Odin) and seeks to destroy them.

Capabilities:
The ability to cause catastrophic events - to churn up the oceans, to poison the sky with a toxic cloud, which leads to global disasters.
Poison Breath - Releases a blue gas from its mouth that is lethal to other dragons when inhaled, and also harms plants and other life.
Powerful jaw - capable of firmly grasping and holding large prey.
Tunneling - can dig passages not in solid rock, but in more flexible environments.
Stealth - despite its size, it can catch you off guard.
Long life and endurance - can exist for centuries without visible access to food and water.

Weaknesses:
His fate is closely tied to Ragnarok. Without triggering the end of time, his power and role are meaningless. The Serpent can be killed with Thor's hammer, but the one who kills him will also perish from the torrent of poison from the mouth of his dead opponent.

Garm:

Appearance:
Garm's chest is covered in dried blood—a sign of his liminal, chthonic nature—he is associated with death. He is a huge dog or wolf with four scarlet eyes.

Character:
Garm is the guardian of the border between the world of the living and Helheim (the realm of the dead). His role is to keep the living from entering the underworld and the dead from escaping. While the gods maintain order, Garm sits quietly, chained, near the cavern of Gnipahellir. But when Ragnarok begins, he is released. At that moment, he is no longer just a guard—he becomes a harbinger and participant in the end of the old world, a being who fulfills his fateful function to the end.

Capabilities:
Garm's main "ability" is an indicator. Its loud barking near the cave was considered a sign that Ragnarok was near or had already begun. In other words, it doesn't actively destroy so much as signal the collapse of order.

Can create rifts between worlds, absorb metaphysical concepts, possesses superhuman strength, durability and elements of regeneration.

Weaknesses:
While he's tethered, the boundary between worlds holds. That is, his "weakness" is his dependence on the bonds (or magical spell) that hold him. When the chain breaks, he gains freedom and becomes truly dangerous. Certain types of magic or weapons are effective against his specific mechanics.

Fenrir:

Appearance:
A huge, gigantic wolf. Often called the "Terrible Wolf," it has a frightening and powerful appearance, with its large head, sharp fangs, and feral gaze.

Character:
Fenrir is ferocious and hostile toward the gods (the Aesir). However, his story contains a twist: when he lived in Asgard, the god Tyr befriended him—he alone dared feed the wolf. However, this trust was shattered when the gods, fearing his power, decided to chain Fenrir. He sensed a trap, and this engendered within him a deep hatred and thirst for revenge. Ultimately, Fenrir became the embodiment of chaos and inescapable fate.

Capabilities:
Immense physical strength. He easily broke chains created by the gods (Leding, Drommi), until the magical Gleipnir appeared.
Supernatural resilience.
He managed to withstand serious trials and punishments.
Acute feelings.
Like a normal wolf, his hearing, smell, and vision are heightened—these abilities are greatly enhanced.

Weaknesses:
Fenrir's key weakness isn't physical, but fateful. The gods couldn't defeat him with brute force, but they found a magical solution: the chain Gleipnir. It was forged by the dwarves from components no longer found in nature (the sound of a cat's footsteps, a woman's beard, mountain roots, bear sinew, fish breath, and bird saliva). It was outwardly thin and soft as silk, which allowed it to deceive the wolf.

The Biblical Beast (from Revelation)

Appearance:
Revelation 13:2 describes it this way: "The beast which I saw was like a leopard, and his feet were like those of a bear, and his mouth was like the mouth of a lion." He also had seven heads and ten horns, with diadems on the horns and blasphemous names on the heads.

Character:
His cruelty, his theomachism, and his lust for power are emphasized. He blasphemes God, wages war against the saints, and attempts to establish world domination.

Capabilities:
He is given great authority and power by the dragon (Satan). He is able to deceive people with false miracles, force them to worship him, and introduce the "mark of the beast" (seal), without which a person cannot buy or sell.

Weaknesses:
There are no direct references to physical weaknesses—the emphasis is on spiritual struggle. His power is believed to be temporary (for example, a period of 42 months is mentioned), and will ultimately be broken by divine intervention.
In Christian theology, this image is often interpreted not as a literal being, but as a symbol—for example, as the personification of the Antichrist or a godless empire.

Cerberus:

Appearance:
Cerberus has three identical bodies. Each of the girls has:
long silvery-white hair pulled back into a ponytail at the end;
large, round, red eyes;
small dog ears on top of their heads (instead of the horns that other demons have);
fangs (visible in sprites at rest).
She is dressed in a bright red long-sleeved shirt, a black striped vest, black tight trousers, a wide belt, black cuffs, gloves and a tie.

Character:
At first glance, Cerberus appears sweet and carefree: she smiles frequently, speaks enthusiastically, and appears quite harmless. But behind this exterior, a more sinister, savage side quickly emerges. She enthusiastically strives to "corrupt the mortal realm" and, at the same time, is ready to tear apart an opponent if they ask uncomfortable questions.

Capabilities:
Superhuman Physical Stats: Incredible strength capable of inflicting lethal damage.
Sound Manipulation: She can make "cute yapping sounds" that can cause heart attacks or cardiac arrest in even the strongest-willed creature.
Resistance: immunity to physical, temperature, biological, magical and spiritual influences.
Multiple Personalities: Although Cerberus has three bodies, they are inhabited by a single soul that controls all three simultaneously. This gives her an advantage in coordinating attacks.
Dimensional Manipulation: Due to her connection with Charon, she is capable of interdimensional manipulation.

Dabbat al-ard

"a moving earthly creature" is one of the signs of the approaching Day of Judgment.

Appearance:
head - like a bull's;
eyes - like a pig's;
ears - like an elephant's;
horns - like a deer;
neck - like an ostrich;
chest - like a lion's;
color - like a tiger;
hips - like a cat's;
tail - like a ram's;
Legs are like a camel's. The distance between the two joints is twelve cubits.
A multi-colored creature, with enough space between its horns for a person to sit. Thick feathers and hooves

Character:
It will be released during a period when unbelief, distortion, and oblivion of religious truths are widespread across the earth. Its appearance is a sign that the line between good and evil has become completely blurred.

Capabilities
Speech. Key feature: Dabbat al-ard will speak to people in a language they understand.
Working with symbols. Along with him, the staff of Prophet Musa and the ring of Prophet Suleiman will appear. With the staff, he will make marks: a white mark will appear on the faces of the righteous, which will eventually spread across their entire face; with the ring, he will touch the faces of the infidels, and a black mark will appear on them, which will also spread.
The Proclamation of Fate. After the marks appear, Dabbat al-ard will announce to the people who will end up in Paradise and who will end up in Hell.
It can emerge from underground not once, but three times.

Weaknesses:
Theological discussions sometimes also touch on "vulnerabilities." For example, it has been suggested that the "animal from the earth" may refer not to some supernatural creature, but, say, to the baby camel of the Prophet Salih's miracle she-camel, which entered a rock and later emerged as a sign. There have also been attempts to interpret this as an allegory (for example, as germs or diseases), but many scholars have rejected such interpretations: the text clearly speaks of a visible animal, which is intended to serve as a visual sign.