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A formidable aquatic serpent that crests on moonlit nights—likely why it has often been mistaken for a mermaid. Despite its appearance, it is extremely aggressive, and tolerates no trespassers on its turf. It expels an intoxicating sleep powder from an organ on its neck, knocking out prey before it can resist.

Somnacanth is a Leviathan first introduced in Monster Hunter Rise.


Somnacanth is a Leviathan with a very unique physiology. Covering its body are large yellowish scales, transitioning to white on the underside. Its front feet have three digits, each one ending in a long, curved black claw. Its back feet have four digits that end in shorter claws. It has fins on each front leg. It has a short face with a disturbingly humanoid appearance. Above its eyes are a pair of large purple horns, with a pair of smaller knob-like protrusions in front of them. Adorning the side of its head are three pairs of small purple fins, with a massive crest-like fin on the top. These purple fins also appear along the top of its tail and form a crescent shape at the tip. It has a hard pad on its belly with a taiko drum-like pattern that it uses to crack open shells. It also features several bioluminescent patches on its body, which can be seen around its eyes, in the mouth, the seams on the throat, and the underside of the tail base.

Behavior and Abilities

Somnacanth can often be seen swimming on its back. It is capable of standing on its tail. It is a very territorial creature, tolerating no trespassers, and can become extremely aggressive.

Somnacanth is capable of producing a sleep-inducing powder in its throat and spraying it through the mouth. Similar to other monsters that can put creatures to sleep, it will use this opportunity to strike at its prey or adversary. It can breathe this powder out as a long ranged, sweeping cone or as a large cloud that covers the whole area. It is capable of jumping high into the air and slamming down on its target. It can also throw dart-like quils in rapid succession. The quils linger on the ground for a few seconds. The darts originate from the end of its crest.

During combat, Somnacanth has a tendency to stand on its tail, keeping its head hard to reach.

It can use its hard belly to crack open shells while laying on its back, similar to otters. These shells have a variety of effects when cracked open, including an explosion that covers hunter in blast powder, a directional flash and even a healing mist that also heals nearby hunters.

In-Game Description

Monster Hunter Rise
MHRise-Somnacanth Icon.png A formidable aquatic serpent that crests on moonlit nights—likely why it has often been mistaken for a mermaid. It expels an intoxicating sleep powder from its neck gills and tail, knocking out prey before it can resist. Some Somnacanth sightings tell of this species making use of unusual shells, so exercise caution if you catch one swimming towards you with a shell in its claws.
Threat Level (危険度): ★★★★★


  • Its English name, Somnacanth, seems to come from the Latin word somna meaning to fall asleep and -canth meaning "spine".
  • Somnacanth is based off of a mixture between Western and Japanese mermaids from folklore as well as sea otters.[2]
  • Somnacanth was originally teased by Ichinose on the official Monster Hunter Twitter.[3]
  • Its crest and tail can be broken. Each foreleg can be broken individually.
  • Somnacanth can occasionally be heard singing short sections of the theme of the area it is encountered in.


Monsters appearing in Monster Hunter Rise (edit)
Herbivore MHRise-Anteka Icon.png Anteka MHRise-Kelbi Icon.png Kelbi MHRise-Kestodon Male Icon.png Kestodon MHRise-Popo Icon.png Popo MHRise-Rhenoplos Icon.png Rhenoplos MHRise-Slagtoth Icon.png Slagtoth
Amphibian MHRise-Zamite Icon.png Zamite
MHRise-Tetranadon Icon.png Tetranadon
Fish MHRise-Gajau Icon.png Gajau
Fanged Beast MHRise-Bombadgy Icon.png Bombadgy MHRise-Bullfango Icon.png Bullfango
MHRise-Arzuros Icon.png Arzuros MHRise-Apex Arzuros Icon.png Apex Arzuros MHRise-Bishaten Icon.png Bishaten MHRise-Goss Harag Icon.png Goss Harag MHRise-Lagombi Icon.png Lagombi MHRise-Rajang Icon.png Rajang MHRise-Volvidon Icon.png Volvidon
Lynian MHRise-Felyne Icon.png Felyne MHRise-Melynx Icon.png Melynx
Neopteron MHRise-Altaroth Icon.png Altaroth MHRise-Bnahabra Icon.png Bnahabra
Temnoceran MHRise-Rachnoid Icon.png Rachnoid
MHRise-Rakna-Kadaki Icon.png Rakna-Kadaki
Bird Wyvern MHRise-Baggi Icon.png Baggi MHRise-Gargwa Icon.png Gargwa MHRise-Izuchi Icon.png Izuchi MHRise-Jaggi Icon.png Jaggi MHRise-Jaggia Icon.png Jaggia MHRise-Wroggi Icon.png Wroggi
MHRise-Aknosom Icon.png Aknosom MHRise-Great Baggi Icon.png Great Baggi MHRise-Great Izuchi Icon.png Great Izuchi MHRise-Great Wroggi Icon.png Great Wroggi MHRise-Kulu-Ya-Ku Icon.png Kulu-Ya-Ku MHRise-Pukei-Pukei Icon.png Pukei-Pukei
Brute Wyvern MHRise-Anjanath Icon.png Anjanath MHRise-Barroth Icon.png Barroth
Fanged Wyvern MHRise-Jagras Icon.png Jagras
MHRise-Magnamalo Icon.png Magnamalo MHRise-Tobi-Kadachi Icon.png Tobi-Kadachi MHRise-Zinogre Icon.png Zinogre MHRise-Apex Zinogre Icon.png Apex Zinogre
Leviathan MHRise-Ludroth Icon.png Ludroth
MHRise-Almudron Icon.png Almudron MHRise-Mizutsune Icon.png Mizutsune MHRise-Apex Mizutsune Icon.png Apex Mizutsune MHRise-Royal Ludroth Icon.png Royal Ludroth MHRise-Somnacanth Icon.png Somnacanth
Piscine Wyvern MHRise-Delex Icon.png Delex
MHRise-Jyuratodus Icon.png Jyuratodus
Snake Wyvern MHRise-Remobra Icon.png Remobra
Flying Wyvern MHRise-Barioth Icon.png Barioth MHRise-Basarios Icon.png Basarios MHRise-Bazelgeuse Icon.png Bazelgeuse MHRise-Diablos Icon.png Diablos MHRise-Apex Diablos Icon.png Apex Diablos MHRise-Khezu Icon.png Khezu MHRise-Nargacuga Icon.png Nargacuga MHRise-Rathalos Icon.png Rathalos MHRise-Apex Rathalos Icon.png Apex Rathalos MHRise-Rathian Icon.png Rathian MHRise-Apex Rathian Icon.png Apex Rathian MHRise-Tigrex Icon.png Tigrex
Elder Dragon MHRise-Chameleos Icon.png Chameleos MHRise-Crimson Glow Valstrax Icon.png Crimson Glow Valstrax MHRise-Kushala Daora Icon.png Kushala Daora MHRise-Teostra Icon.png Teostra MHRise-Thunder Serpent Narwa Icon.png Thunder Serpent Narwa MHRise-Narwa the Allmother Icon.png Narwa the Allmother MHRise-Wind Serpent Ibushi Icon.png Wind Serpent Ibushi