Lagiacrus, the legendary Thunder Leviathan, has made its electrifying return in Monster Hunter Wilds with Title Update 2. This fan-favorite monster brings a mix of nostalgia and fresh challenges, especially for hunters who never faced it in previous games. Whether you’re a seasoned veteran or a newcomer, taking down Lagiacrus requires strategy, preparation, and a solid understanding of its moves. Here’s everything you need to know to conquer this aquatic terror.
Before you can fight Lagiacrus, you’ll need to meet a few requirements. First, reach Hunter Rank 31 or higher. Then, complete the main story mission “A World Turned Upside Down” and the side quest “Forest Doshaguma” for Erik in the Scarlet Forest. Once these are done, reset the area by resting at camp or leaving and returning—this triggers Erik to offer the “Trembling Blue Currents” quest.
Unlike most hunts, this mission requires you to capture Lagiacrus instead of slaying it, so bring traps and tranq bombs. If you’re looking for an even tougher challenge, Tempered Lagiacrus unlocks at HR 41, offering better rewards and a fiercer fight.
Preparing for the Fight
Lagiacrus is no pushover, so gear up properly before heading out.
Best Weapons and Elements
- Fire, Ice, and Dragon weapons are the most effective. Fire deals the highest damage, especially when targeting its back and tail.
- Avoid Thunder and Water weapons—Lagiacrus resists its own elements.
- Blunt weapons like hammers can stun it by focusing on the head, while severing weapons should aim for the tail to limit its deadly attacks.
Essential Items
- Nulberries – Lagiacrus inflicts Thunderblight, which makes you more vulnerable to stuns. Nulberries cure this quickly.
- Mega Potions & Crafting Materials – You’ll burn through healing items, so bring extras.
- Traps & Tranq Bombs – Since you need to capture it, have at least one Shock Trap and Pitfall Trap (though Pitfall is less effective).
- Thunder Resistance Gear – If your armor has low Thunder resistance, consider swapping pieces or eating a meal that boosts it.
Lagiacrus’ Weaknesses and Attack Patterns
Knowing where to hit and how to dodge is half the battle.
Weak Points
- Head – High damage zone, especially for blunt weapons.
- Back – Glows after Thunder attacks; hitting it during this window deals massive damage.
- Tail – Severing it reduces its range and attack options.
Dangerous Moves to Watch For
- Thunder Discharge – Lagiacrus charges electricity in its spines before unleashing a wide AoE blast. Run away when you see its back glow blue.
- Lunging Tail Swipe – Dodging opposite the tail’s swing direction avoids this heavy hit.
- Underwater Thunder Shot – In water, it fires lightning projectiles—dodge sideways to evade.
- Lightning Vortex – Creates a whirlpool that pulls you in before exploding. Swim away immediately.
Underwater Combat Tips
A unique part of this fight is the underwater phase in Area 19 of the Scarlet Forest. Here’s how to survive:
- You can’t use weapons normally—instead, rely on grappling hooks and environmental traps.
- Dodge upward to avoid body tackles—sideways movement is too slow.
- Use submerged rubble—trigger it with your slinger when Lagiacrus swims underneath for big damage.
- Aim for weak points—after certain attacks, its mouth or back becomes vulnerable.
