Ryatroxos by Nrex117
Titles Terrible King of Drakes
Nicknames Split-Chin, Split Jaw
General Info
Species Fanged Wyvern
Habitats Scorched Plateau, Primeval Coastline, Jurassic Frontier, Primal Forest, Misty Peaks, Heaven's Mount, Flooded Forest, Verdant Hills, Dunes, Ancestral Steppe, Sandy Plains, Deserted Island, Marshlands, Desert, Volcano (3rd), Great Forest, Ruined Ridge, Wildspire Waste, Ancient Forest, Old Jungle, Jungle, Everwood, Sunken Hollow, Volcanic Hollow, Volcano.
Size 3174.36 cm (Largest)

1803.0 cm (Smallest)

Relatives Anatroxos
Signature Move 360* Bite
Elements Element Dragon (Enraged only)
Ailments Status Corrosion
Status Bleeding
Element Dragon (Enraged only)
Weaknesses Element Ice
Element Water (Enraged only)
Creator Nrex117


Ryatroxos (Ree-Uh-Trocks-Os) is a large and powerful, quadrupedal Fanged Wyvern characterized by its crests, serpent like lower jaws and well developed forelegs. Its thick hide is littered with hard boney osteoderms and scutes as well as long acid filled spines along its back and tail which provide Ryatroxos with protection. Ryatroxos has a narrow and notched upper jaw filled with rows of razor sharp teeth and fangs and its lower jaw is able to split in a similar manner to serpents and move independently from one another. It has four powerful legs with large claws like most other Fanged Wyverns, but it is able to use its forelegs as arms unlike other fanged wyverns. It also holds its legs directly under its body as opposed to the sides. All of its four limbs have three walking digits with thick and powerful talons and pseudo thumbs to help grip objects and aid in bearing weight.


​As a quadrupedal Fanged Wyvern, its arms have evolved into forelegs, which allow it to move at great speeds with excellent mobility. Though its forelegs are developed to bear its weight it still has strong enough digits and claws to use as weapons. Ryatroxos have highly evolved lower jaws that have gained the ability to move independent from one another, these jaws posses large fangs that produce a highly corrosive and toxic, acidic venom that it uses to disable prey and would be attackers.  


When not engaged in battle Ryatroxos can be seen wandering its territory in search of intruders, if it catches a scent or sight of an intruder, be it hunter or rival monster, it will proceed to attack its foe. Ryatroxos are relentless and aggressive predators. Ryatroxos usually splits its jaws when it roars at its foes, this is a threat display and an attempt to deter a would be aggressor. Ryatroxos are super-predators and are able to take the territory of other monsters with ease but unlike other powerful Monsters like Deviljho, Ryatroxos is not nomadic and tends to stick in an territory as long as it can.


Because of its highly territorial nature, Ryatroxos are difficult to observe but most specimens have been spotted in warm and tropical areas such as swamps, jungles and deserts and some have even been know to inhabit volcanic areas but is it assumed they can live in most other other areas as well.

In-Game Description​

N/A Ryatroxos are a unusual and large theropod like Fanged Wyvern known for their thick scaly hide, splitting jaws and corrosive venom. Among some of the largest Fanged Wyverns found thus far and with a temperament and ferocity to rival a Deviljho, this monster is a danger to even the most elite or hunters!



  • ​Order: Saurischia
  • Suborder: Four Legged
  • Infraorder: Theropod Fang Wyvern
  • Superfamily: Splitting Jaw Wyverns
  • Family: Atrox

Ryatroxos is a uniquely evolved member of the Fanged Wyvern classification of monsters. Other members this group are the Zinogre and Odogaron.

Habitat Range:

​Ryatroxos can be found living in almost every environment even in hard to live areas like the dunes and volcano, the only environment they seem to be absent in is the tundras and other cold areas.

Ecological Niche:

Ryatroxos is an incredibly powerful apex predator that is high on the food chain. Ryatroxos can easily prey on monsters such as Aptonoth, Larinoth, Bulldrome, Velocidrome and even other large monsters such as Yian Kut Ku and Congalala. Ryatroxos are also some of the few natural predators of the gargantuan Validoth. Despite being an apex predator, Ryatroxox has to compete with other large predatory monsters. Monsters like Zinogre, Tigrex, Rathalos and Rathian are potential threats to young or sick Ryatroxos. And despite having many predators to deal with are quite deadly themselves with their corrosive venom and brute strength making them more than a match for such competition.

Biological Adaptations:

Ryatroxos most unique feature is its jaws which are able to unhinge and spread apart to aid in swallowing smaller prey whole and tearing larger chunks out of large prey similar to the jaws of a snake. Another feature Ryatroxos shares with snakes are heat sensing pits at the end of its snout that it uses to help track prey. Another unique feature Ryatroxos posses are its well developed for limbs that even have a pseudo-thumb and large thick claws used for grappling and wrestling other monsters to the ground, these forelimbs even allow it to take a semi-quadrupedal stance and aid in making sharp turns. Ryatroxos also posses a unique venom that is highly toxic and corrosive, this venom is used to weaken and soften up its prey when it bites allowing for chunks to be easier to rip off and swallow. Ryatroxos can also use its acidic venom for self defense and can spit it as a projectile that explodes on contact or be left to detonate, stream or even a mist. Despite its large size it is quite agile and can move at high speeds and even jump and pounce onto prey.


Ryatroxos are relentless, aggressive predators with surprising skills in battle. These skills have made hunters consider them to be one of the most intelligent and powerful Fanged Wyverns. Their territories are marked with singe marks from their corrosive venom. These monsters are mainly active during the day thus making them diurnal. While adults Ryatroxos live a mostly solitary life, the young hatch lings are known to wonder away from the mothers nest in gangs to hunt on their own from time to time.


Quadrupedal Attacks

Charge - A simple charging attack where it runs towards the hunters in hopes of trampling them, can quickly turn when preforming this attack.

Shoulder Slam - Ryatroxos lunges towards hunters in an attempt to hit them with its shoulders.

Bite - A simple bite that deals moderate damage to a hunter.

Acid Projectile - Ryatroxos will fire a projectile of acid at a hunter dealing massive damage, similar to a Glavenus fireball. Inflicts corrosion.

Rear Kick - Ryatroxos kicks backwards towards anything standing behind it with either one of its hind legs dealing moderate damage.

360 Acid Mist - Ryatroxos will spin in a circle spreading its acidic mist.

Frontal Stomp - Ryatroxos quickly slams the ground with it arms and claws dealing heavy damage to anyone caught in the radius of the attack.

Multi Acid Projectile - Ryatroxos rears back and fires 3 corrosive projectiles towards its targets dealing high damage.

Tail Swipe: Ryatroxos swings its tail from side to side in an attempt to hit its foes dealing moderate damage.

Hip Check - A simple hip check that can knock hunters down.

Head-butt - A heavy hitting attack where a hunter is hit with the full force of an Atroxlong crest sending them flying upwards.

Tail Spin - Ryatroxos spins around using its tail to hit the hunter to knock them down dealing high damage.

Acid Mist - Ryatroxos will spew a mist of acid that will linger in the area and deal continuous damage to hunters caught in the mist. Inflicts corrosion.

Corrosion Bite - Ryatroxos will unhinge its jaws and lunge towards a hunter dealing high damage and inflicting corrosion.

Stomp - Ryatroxos will preform a stomp attack.

Claw Swipe - Ryatroxos will swing at a hunter with its powerful arms, can be done multiple times with each arm.

180 Bite - Ryatroxos will quickly turn around towards a hunter and give a corrosion bite, can be done more than once.

Tail Slam - Ryatroxos slams its powerful tail into the ground causing the ground to shake.

Pounce - Ryatroxos will leap towards a hunter and land on them dealing high damage.

360 Bite - Ryatroxos spins around with its jaws unhinged dealing heavy damage and inflicting corrosion.

Enraged Attacks

Corrosive Pounce: Ryatroxos claws start to drip with highly corrosive acid and dragon energy. Aroxlong will lunge at hunters with its claws hoping to gore them dealing massive damage and causing an explosion of corrosive acid and dragon energy in the nearby area. Inflicts corrosion and dragonblight.

Acid Stream: Ryatroxos fires a powerful concentrated stream of acid and dragon energy projectiles that explodes violently when hitting the ground dealing massive damage. Inflicts corrosion and dragonblight.

All of Ryatroxos normal attacks now inflict corrosion when it is enraged.


Low Rank Carves:

Icon Name Description
Fang Icon Dark Green


A large grooved fang designed to inflict deep wounds and for the transport of the most deadly of toxins.
Hide Icon Dark Red
Ryatroxos Hide A thick, durable and acid resistant hide of an Ryatroxos perfect for shrugging off even the most fatal of blows.
Sac Icon Dark Green


An organ from a Ryatroxos containing the most toxic and caustic substance known to man!
Scale Icon Dark Red
Ryatroxos Scale A hard scale carved from an Ryatroxos hide that is surprisingly heavy for its size.
Carapace Icon Grey
Ryatroxos Carrapace A carapace formed from thick layers of scales over a single rigid bone give Ryatroxos all the armor it needs.
Horn Icon Grey
Ryatroxos Scute A hard horn like scale that can be found atop an Ryatroxos carapace.
Claw Icon Black
Ryatroxos Talon A large, sharp and sturdy claw carved from an Ryatroxos fore limb. It is sharp enough to cut steel!
Monster Parts Icon Red
Ryatroxos Crest A pair of horn like crests carved from an Ryatroxos, sturdy and hard. These structures are used to produce the dragon element.




  • Ryatroxos is the dominant predator in the Scorched Plateau.
  • When it is enraged acidic mist covers its upper body and arms and its crest will cackle with dragon energy.
  • Ryatroxos is based on multiple species of animals both extant and extinct!
    • Some of the animals it is based on includes theropod dinosaurs like Dilophosaurus and Giganotosaurus. It also has features based on the prehistoric crocodile and dinosaur relative Saurosuchus. Some modern animals that provided some inspiration for some of Ryatroxos features are Spitting Cobras and Horned Vipers.
  • When low on stamina Ryatroxos will either hunt smaller monsters, feed from a carcass or feed on weakened, sleeping or dead large monsters.
    • Ryatroxos will feed from dropped raw meat when low on stamina, it will not however feed from poisoned, tainted or drugged meat even if it is low on stamina.
  • Ryatroxos tail can be severed after it is scarred.
  • Ryatroxos Crest and head can be damaged.
  • Ryatroxos roar requires HG earplugs to block.
  • Ryatroxos is one of the few monster with the power and ferocity to actively hunt other large monsters such as Validoth and Sicarapax!
  • Ryatroxos are a rival species to Ferrumos and often compete violently to become top predators of a region.
  • Ryatroxos was originally called Atroxlong and was a Brute Wyvern.

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