Mutation is one of the most engaging mechanics in Monster Hunter Stories 3: Twisted Reflection, transforming ordinary Monsters into Subspecies or Deviant variants that can significantly impact gameplay. Unlike previous entries, mutations are no longer hidden behind chance. The game clearly outlines the requirements for each mutation in the Monsterpedia, making it easier for players to strategically plan habitats and expand their Monstie roster.

This guide will contain major spoilers, so please take note of that before scrolling through!

Understanding Monsters Mutation

In Monster Hunter Stories 3: Twisted Reflection, mutation is closely tied to the Habitat Restoration system. Players actively manage ecosystems by hatching monsters, introducing them to new regions, and carefully raising the species rank of each habitat. Mutations occur when specific environmental conditions are met, often requiring certain monsters to coexist or reach a designated rank in a region.

The Monsterpedia allows players to track Monsters with mutation potential and the exact conditions required. This transparency turns what could be a random process into a deliberate planning strategy. By monitoring species rank and habitat composition, players can target specific mutations and optimize their ecosystem for maximum results.

Subspecies Mutations

Subspecies are alternate forms of existing Monsters that often feature unique appearances, behaviors, and combat abilities. They typically appear when a Monsters is placed in a habitat with non-native conditions or when the ecosystem contains the right combination of monsters. Subspecies are valuable for expanding the gene pool, acquiring rare skills, and unlocking Environment Skills for future breeding.

Deviant Mutations

Deviant Monsters are rare and powerful variants that represent extreme evolutionary forms. They usually do not spawn naturally in the overworld, appearing only after specific habitat and ecosystem conditions are met. Deviants are important for gene collection, Environment Skills, and strategic breeding, giving players early access to highly valuable Monsties.

Planning for Mutations

Triggering mutations requires careful ecosystem management. Raising species rank improves egg quality and unlocks advanced mutations. Introducing non-native monsters can create new mutation opportunities, and monitoring the Monsterpedia allows players to design habitats with precision. Mutations impact long-term strategy, influencing which species appear in future eggs and which rare or powerful Monsters become available.

Monsters That Can Mutate

Below is a catalog of Monsters that can mutate into Subspecies or Deviant forms, along with all known requirements.

Deadeye Yian Garuga

Deadeye Yian Garuga is a Deviant of Yian Garuga, representing a more formidable variant.

• Requirement 1: Yian Garuga Ecosystem Rank is S
• Requirement 2: Mutation occurs in habitats where many ferocious monsters reside
• Requirement 2 Detail: Resides in habitats containing 3 or more monsters equal or greater rank than the Yian Garuga

Hellblade Glavenus

Hellblade Glavenus is a Deviant of Glavenus, exhibiting a more extreme form of the base species.

• Requirement 1: Glavenus Ecosystem Rank is S
• Requirement 2: Mutation occurs in habitats where many monsters with razor-shaped appendages reside
• Requirement 2 Detail: Resides in habitats containing 4 or more monsters with razor-shaped appendages, such as Shogun Ceanataur, Seregios, Great Izuchi, Magnamalo

Soulseer Mizutsune

Soulseer Mizutsune is a Deviant of Mizutsune, arising under competitive environmental conditions.

• Requirement 1: Mizutsune Ecosystem Rank is S
• Requirement 2: Mutation occurs in habitats where monsters that are known as bitter rivals reside
• Requirement 2 Detail: Resides in habitats containing 1 or more endangered monsters that charge the ground with electricity-imbued bodies and are bitter rivals (Zinogre) of Mizutsune

Ivory Lagiacrus

Ivory Lagiacrus is a Subspecies of Lagiacrus, adapted to specific environmental conditions.

• Requirement 1: Lagiacrus Ecosystem Rank is A

Stygian Zinogre

Stygian Zinogre is a Subspecies of Zinogre, distinguished by traits that emerge in certain habitats.

• Requirement 1: Zinogre Ecosystem Rank is A

Thunderlord Zinogre

Thunderlord Zinogre is a Deviant of Zinogre, evolving under specific rival interactions.

• Requirement 1: Zinogre or Stygian Zinogre Ecosystem Rank is S
• Requirement 2: Mutation occurs in habitats where monsters that are known as bitter rivals reside
• Requirement 2 Detail: Resides in habitats containing 1 or more endangered monsters that possess enchanting purple fur and are bitter rivals (Mizutsune) of Zinogre

Pink Rathian

Pink Rathian is a Subspecies of Rathian, representing a color variation influenced by ecosystem conditions.

• Requirement 1: Rathian Ecosystem Rank is B

Dreadqueen Rathian

Dreadqueen Rathian is a Deviant of Rathian, appearing in regions with concentrated poisonous species.

• Requirement 1: Rathian or Pink Rathian Ecosystem Rank is S
• Requirement 2: Mutation occurs in habitats where many poisonous monsters reside
• Requirement 2 Detail: Resides in habitats containing 3 or more poisonous monsters

Sand Barioth

Sand Barioth is a Subspecies of Barioth, adapted to arid environmental zones.

• Requirement 1: Barioth Ecosystem Rank is A

Green Nargacuga

Green Nargacuga is a Subspecies of Nargacuga, emerging under particular regional conditions.

• Requirement 1: Nargacuga Ecosystem Rank is A

Silverwind Nargacuga

Silverwind Nargacuga is a Deviant of Nargacuga, influenced by habitats with wind-controlling monsters.

• Requirement 1: Nargacuga or Green Nargacuga Ecosystem Rank is S
• Requirement 2: Mutation occurs in habitats where many monsters that rule the wind reside
• Requirement 2 Detail: Resides in habitats containing 2 or more monsters that control the winds, such as Great Izuchi, Legiana, and Paolumu

Boltreaver Astalos

Boltreaver Astalos is a Deviant of Astalos, forming in areas dominated by thunderous energy.

• Requirement 1: Astalos Ecosystem Rank is S
• Requirement 2: Mutation occurs in thunder elemental areas
• Requirement 2 Detail: Resides in habitats containing 3 or more thunder elemental monsters

Azure Rathalos

Azure Rathalos is a Subspecies of Rathalos, representing a rare regional variant.

• Requirement 1: Rathalos Ecosystem Rank is A

Dreadking Rathalos

Dreadking Rathalos is a Deviant of Rathalos, appearing in habitats dominated by high-ranking aerial monsters.

• Requirement 1: Rathalos or Azure Rathalos Ecosystem Rank is S
• Requirement 2: Mutation occurs in habitats where dreaded monsters that reign over the heavens reside
• Requirement 2 Detail: Resides in habitats containing 4 or more Flying Wyverns

Brute Tigrex

Brute Tigrex is a Subspecies of Tigrex, shaped by competitive local fauna.

• Requirement 1: Tigrex Ecosystem Rank is A

Grimclaw Tigrex

Grimclaw Tigrex is a Deviant of Tigrex, emerging in habitats with multiple high-powered monsters.

• Requirement 1: Tigrex or Brute Tigrex Ecosystem Rank is S
• Requirement 2: Mutation occurs in habitats where many powerful monsters reside
• Requirement 2 Detail: Resides in habitats containing 4 or more power-type monsters

Bloodbath Diablos

Bloodbath Diablos is a Deviant of Diablos, forming in areas frequented by hunters.

• Requirement 1: Diablos or Black Diablos Ecosystem Rank is S
• Requirement 2: Mutation occurs in areas with many hunters
• Requirement 2 Detail: Resides in Diablos or Black Diablos habitats in Tarkuan’s Bountiful Dunes

Conclusion

Mutation in Monster Hunter Stories 3: Twisted Reflection is a key strategic element that rewards players who actively manage their habitats and species ranks. Subspecies and Deviant Monsters extend the gene pool, and provide combat differences. By carefully planning ecosystems, monitoring the Monsterpedia, and prioritizing specific species interactions, players can deliberately cultivate rare and powerful Monsties to enhance both their roster and long-term breeding strategy.