If you have been wandering the vibrant, monster-filled landscapes of Monster Hunter Stories 3: Twisted Reflection at night and suddenly found yourself face-to-face with a creature far beyond your current strength, you have likely encountered an invasive monster. These are not your standard field encounters; they are high-threat puzzles disguised as combat, designed to challenge your understanding of the game’s mechanics rather than just your raw power. Your initial goal is not to slay them outright, but to repel them by meeting a specific, often obscure condition during the fight.
Understanding the Invasive Monster System
The invasive monster system represents a significant evolution of the side-content in Monster Hunter Stories 3. These creatures appear exclusively at night in hidden or hard-to-reach corners of each region. They function as gatekeepers to a crucial reward: rare eggs belonging to endangered monster species that have vanished from the ecosystem. Successfully repelling one grants access to its den, where players can obtain eggs for powerful monsters like Rathian, Zinogre, Mizutsune, and their variants. This makes engaging with these challenging encounters essential for players aiming to complete their Monstie roster.
Preparing for the Challenge
Before seeking out these formidable foes, adequate preparation is non-negotiable. These battles are designed to test specific strategies, and arriving with the wrong gear or Monstie will result in a swift defeat. Players should ensure their weapon and armor loadouts are optimized, with skills that complement the intended strategy for each monster. The right preparation transforms these encounters from frustrating roadblocks into satisfying tactical puzzles.
Complete Invasive Monster Guide
What follows is a comprehensive breakdown of every invasive monster confirmed within Monster Hunter Stories 3, detailing their exact locations, the precise conditions required to repel them, and the valuable rewards that await.
Invasive Yian Garuga
Location and Repel Strategy
The Invasive Yian Garuga serves as the player’s introduction to this system, found on the far eastern side of Sunpedal Plains in Azura, northeast of the lookout point. The repel condition is straightforward but requires focused aggression: you must break its legs. Equip a Great Sword or Long Sword and direct all attacks, including those from your Monstie, onto the Garuga’s legs until it collapses. Its retreat will lead you to a den containing an endangered Rathian egg.
Invasive Arzuros
Location and Repel Strategy
This monstrous bear awaits at Blessing Hill on the southern tip of Canalta Timberland. Its gimmick revolves around its honey reserves. The Arzuros will summon additional Arzuros using honey; defeating these summons depletes its stockpile. The key is to survive its devastating Invasive Honey Rush attack—using Critical Eye skills to evade is recommended—while systematically eliminating its reinforcements. Once its honey is exhausted, it flees, granting access to an endangered Canine egg. Note that this monster only appears after certain story progression.
Invasive Plesioth
Location and Repel Strategy
Veterans will shudder at the name. Found in an underground cavern accessed through a narrow channel north of the Mirror Lake island in Azura, the Invasive Plesioth demands fire. After surviving the initial phase, glowing water sacs will appear on its head. The repel condition is met by dealing sufficient fire damage to this weak spot. Bring a fire-type Monstie and consider a fire weapon or Gunlance explosives. Choosing Kora as your ally partner can provide a significant advantage. Success yields a Lagiacrus egg.
Invasive Seregios
Location and Repel Strategy
Located at the northwest cliff top of the Mirror Lake area in Azura, the Invasive Seregios requires surgical precision. The only way to repel this agile monster is to use a hammer’s Perfect Crush skill with perfect timing during a head-to-head clash. This specific counter-attack is the sole trigger. Executing it flawlessly ends the battle and rewards the player with an endangered Astalos egg.
Invasive Nerscylla
Location and Repel Strategy
This spider lies in wait by a lake in the southeast corner of Blessing Hill, Canalta Timberlands. A Gunlance is mandatory for this encounter. The strategy is reactive: watch for when the Nerscylla targets you with its telegraphed Invasive Death Scissors attack, indicated by a red cone. The moment it fires, counter immediately with the Gunlance’s Wyvern Blaze move. A well-timed blast will send it scurrying to its den, which holds an endangered Nargacuga egg.
Invasive Odogaron
Location and Repel Strategy
Tucked away in a high ledge in Rococo Rocks, Tarquan, the Invasive Odogaron demands a two-step process. First, you must focus attacks to break its claws. Second, you must trap it using an Almudron’s Muddy Hell or Mud Torrent move, which coats it in mud. With its claws broken and mud applied, the Odogaron will slip and fall when it attempts its Invasive Crimson Claw attack, triggering the repel. The reward for this coordinated effort is an endangered Zinogre egg.
Invasive Shogun Ceanataur
Location and Repel Strategy
Hidden behind a waterfall in the Canalta Timberlands, this crab-like monster tests your support skills. When it targets a specific ally—human or Monstie—you must boost that ally’s defense on the same turn. Using a Mega Armorskin is the most straightforward method. Alternatively, a regular Armorskin combined with the Hunting Horn buff Springy Staccato (which can be found on the Khezu Horn or via a decoration) will also suffice. A successful defense boost causes its attacks to bounce harmlessly, forcing a retreat to its den and an endangered Mizutsune egg.
Invasive Diablos
Location and Repel Strategy
Lurking in a canyon in the Colossal Dragon’s Remains area of Tarquan, the Invasive Diablos turns the battle into a game of anticipation. When the fight intensifies, it will burrow and create three holes. Players must equip a hammer with the Meteor Hammer attack, watch the holes carefully, and strike the exact moment the Diablos’s dust pattern appears at one of them. A perfectly timed hit will send it fleeing, leaving behind an endangered Tigrex egg.
Invasive Khezu
Location and Repel Strategy
The final confirmed invasive monster resides in the icy northern reaches of Glacial Caps in Sarrathus. This fight is a battle of attrition and readiness. You must consistently prevent it from building its Wyvern gauge by winning head-to-head clashes and landing stuns. The climax comes when it prepares its Wyvern Soul Eater move. To repel it, you must be mounted on your Monstie with a full kinship gauge and unleash a kinship super move to cancel its attack completely. Your prize is an endangered Barioth egg.
These invasive encounters exemplify the depth of Monster Hunter Stories 3’s design, moving beyond simple combat to challenge a player’s adaptability, preparation, and mastery of specific game mechanics. Each successful repel feels like solving a complex puzzle, with the reward being a direct contribution to rebuilding the game’s world by restoring its most powerful and rare creatures to your stable. As the community continues to explore every corner of the map, this list of elusive guardians is almost certain to grow, promising further challenges and rare discoveries for dedicated Riders.
