The Ultimate Hunter’s Guide: 5 Steps To Unlock The Lagiacrus Quest In MH3U And MHGU
The Lagiacrus quest—hunting the "Lord of the Seas"—is one of the most iconic and often confusing milestones for new hunters in the *Monster Hunter* franchise. Unlike many monsters that appear automatically, this Leviathan is locked behind specific, often obscure Village and Hub progression lines, making it a frequent source of frustration for players looking to craft its powerful armor and weapons.
This definitive guide, updated for December 2025, breaks down the exact, step-by-step requirements to unlock the Lagiacrus hunt in both *Monster Hunter 3 Ultimate* (MH3U) and *Monster Hunter Generations Ultimate* (MHGU). Whether you’re braving the deep waters of Moga Village or tackling G-Rank quests in the Hub, we have the precise path you need to follow.
Lagiacrus Quest Progression in Monster Hunter 3 Ultimate (MH3U)
In *Monster Hunter 3 Ultimate*, the Lagiacrus is the main antagonist of the Low Rank Village storyline. Unlocking the final hunt requires a series of mandatory quests that introduce you to the monster and the unique challenges of underwater combat.
The Village Questline: Low Rank Progression
The Lagiacrus story begins in Moga Village. You must complete key quests to advance the storyline until the monster is finally available to hunt. The initial encounter is a "repel" quest, not a kill quest, which is a common point of confusion for new hunters.
- Step 1: Complete 1-Star and 2-Star Key Quests. This involves hunts like "The Royal Ludroth," "Urgent: The Fisherman’s Fiend (Plesioth)," and "The Creeping Venom (Great Wroggi)."
- Step 2: Unlock the 3-Star Quest "Guts: It's What's for Dinner." This is your first mandatory encounter with the Lagiacrus. You will not kill it; you must simply survive and repel it from the Deserted Island's underwater areas.
- Step 3: Complete Remaining 3-Star and 4-Star Key Quests. After the repel, you must continue to progress through the mandatory 4-Star quests, including "The Volcano’s Fury (Volvidon)" and "A Royal Pain (Royal Ludroth)."
- Step 4: Unlock the 5-Star Urgent Quest: "Fell the Lagiacrus!" This is the quest where you finally get to hunt and carve the Lagiacrus. Upon completion, the Village storyline progresses to the next major monster, the Duramboros.
Note on MH3U Subspecies: After defeating the standard Lagiacrus, the story will eventually lead you to the High Rank subspecies, the Ivory Lagiacrus, and later, the powerful G-Rank monster, the Abyssal Lagiacrus.
Unlocking Lagiacrus in Monster Hunter Generations Ultimate (MHGU)
The quest to hunt Lagiacrus in *Monster Hunter Generations Ultimate* is different, as it is a returning monster added later in the game's progression. It is typically unlocked through specific Village or G-Rank side quests, rather than being part of the main Low Rank key quest chain.
The Yukumo Village Side Quest: "Lagiacrus Fuss"
For a guaranteed Low Rank hunt, you need to complete a series of requests from the Head Moga Farmer in Yukumo Village. This is often the most reliable way to unlock the monster's materials early on.
- Prerequisite Quests: Complete the 4-Star Village Quest "Royal Pains" (Royal Ludroth) and the 5-Star Village Quest "The Thunderclaw Wyvern" (Zinogre).
- The Request: After completing the prerequisites, speak to the Head Moga Farmer in Yukumo Village.
- The Quest: This interaction unlocks the 5-Star Village Quest, "Lagiacrus Fuss," which is your kill quest for the standard Lagiacrus.
G-Rank Unlock: The "Forest Doshaguma" Side Quest
If you are already in the G-Rank Hub, the Lagiacrus may be unlocked through a specific side quest in the Scarlet Forest, which is a common source of confusion due to its name.
- Prerequisite: Be Hunter Rank (HR) 31 or higher and complete the G-Rank Urgent Quest "A World Turned Upside Down" (Seregios).
- The NPC: Speak to Erik in the Scarlet Forest. He will give you the side mission to capture a Doshaguma.
- The Quest: Completing the Doshaguma capture quest (sometimes listed as "Forest Doshaguma") will unlock the Lagiacrus quest in the G-Rank Hub.
Essential Hunter Tips for Your First Lagiacrus Hunt
Lagiacrus is a powerful Leviathan that commands the element of Thunder. It is famous for its terrifying underwater combat in *MH3U* and its powerful land-based attacks in *MHGU*. Entering the fight unprepared is a recipe for a quick cart.
Lagiacrus Weaknesses and Recommended Gear
To maximize your damage and survive its elemental assaults, focus on its primary weakness and bring the right defensive items.
- Primary Elemental Weakness: Fire. Bring a weapon with a Fire element to the fight.
- Secondary Weaknesses: Ice and Dragon.
- Resistances: Thunder and Water. Avoid using these elements.
- Status Ailment: Lagiacrus is most susceptible to Poison.
- Defensive Strategy: Lagiacrus inflicts Thunderblight, which makes you susceptible to being stunned. Pack Nulberries to cure it, or wear armor with high Thunder Resistance.
- Key Breakable Parts: Head, Back (in *MH3U*), and Tail (can be severed for an extra carve and a chance at the rare Lagiacrus Plate).
Mastering Underwater Combat (MH3U Only)
The underwater segment of the Lagiacrus fight in *Monster Hunter 3 Ultimate* is where most hunters struggle. The change in movement and camera control can be jarring, but the right weapon can make all the difference.
The best weapons for underwater fighting are those with good reach and a reliable guard, allowing you to maintain constant pressure while minimizing exposure to his powerful electric charges.
- Lance: Highly recommended. Its underwater moveset allows for steady thrusting and a reliable block to counter the Lagiacrus’s powerful charge and electric attacks.
- Gunlance: Excellent for the same reasons as the Lance, providing both defense and explosive damage.
- Switch Axe: The Sword Mode's reach and ability to stick to the monster can be very effective, especially for hitting the back and head.
- Luring Strategy: In the Deserted Island, you can often lure the Lagiacrus out of the water and onto land (Area 10), where movement is easier. However, be aware that its land attacks are still formidable.
By following the specific quest prerequisites for either *Monster Hunter 3 Ultimate* or *Monster Hunter Generations Ultimate*, and preparing with a Fire weapon and Nulberries, you will be fully equipped to take on the Lord of the Seas and claim those coveted Lagiacrus Scales and Wyvern Tears for your next armor set. Happy hunting!
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