Lagiacrus are Leviathans introduced in Monster Hunter 3.
Physiology
When a Lagiacrus is fully sunbathed, it turns a dry grayish-blue color and its dermal spikes turn brown. When it returns to the water, Lagiacrus regains a striking deep blue color and its spikes return to their original color of a very light beige.
Abilities
The dermal spikes on its back glow white when it is using strong thunder attacks, and its mouth gurgles with Thunder when it is enraged.
Habitat
Lagiacrus is found only at the Deserted Island, Flooded Forest and Misty Peaks. It's most at home underwater, but is more than capable of fighting on land.
Game Appearances
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In-Game Description
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Element/Status Effectiveness
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Item Effectiveness
| Item Effect | |||||
| Item Name | Able | Effectiveness | Duration (1st time) | Duration (2nd time) | Notes |
| Pitfall Trap | ✔ | ★☆☆ | Works only when on land. | ||
| Shock Trap | ✔ | ★★☆ | Works on land and underwater. | ||
| Flash Bomb | ✔ | ★★☆ | |||
| Sonic Bomb | ✔ | ★☆☆ | Flinches and drops a shiny item | ||
| Dung Bomb | ✔ | ★★☆ | |||
| Meat | x | ☆☆☆ | |||
Damage Effectiveness
For the damage formula (how it's calculated), hitzone charts, Lagiacrus info and more click the following links: Monster Hunter 3 Damage Formula or Monster Hunter 3 Hitzone Charts. Images created by Inkoseh.
MHGen Breakable Parts
| Head (x1) | |
  
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| Back (x1) | |
 
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| Chest (x1) | |
 
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| Front Claws (x1) | |
 
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| Tail (Sever) | |
 
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Notes
General Notes
- Lagiacrus shares many conditions with Rathalos:
- Both held the title of a flagship monster.
- Even though they are flagship monsters, they don't have their own theme music.
- Both are weak to each other's elemental powers.
- Both appear in Tri's opening movie.
- Both have their subspecies appear in MH3U's opening.
- Both have a subspecies that inhabits the same habitat as them and a rare species that shares habitats with Elder Dragons.
- Both are the only old flagship monsters that can be fought in 3U's low ranked quests.
- Breaking its dermal spikes reduces its ability to use electrical attacks.
- When low on stamina, it will fail to use its electrical charge attacks.
- Hitting Lagiacrus with any kind of bomb (including Sonic Bombs and Crag/Cluster shots) underwater may cause it to drop an item.
- A Lagiacrus either will eat an Epioth, or come up on land for air to recover Stamina - however, both often give no indication of Stamina recovery.
- The Lagiacrus is the biggest Leviathan that dwells in the water, since the Ceadeus is considered an Elder Dragon.
- When Lagiacrus hits an underwater pillar or a rock and destroys it, it may drop an item (Offline mode only).
- Lagiacrus' roar requires Earplugs to block.
- Lagiacrus does not return in Monster Hunter Portable 3rd. However, it does appear in MH Diary: Poka Poka Airu Village, and returns in Monster Hunter 3 Ultimate and MH Diary: Poka Poka Airu Village G.
- Lagiacrus shares some of its physical attacks with Royal Ludroth and Agnaktor.
Monster Hunter 3
- Lagiacrus is the first Leviathan of its kind to be encountered in Monster Hunter 3.
- When encountered for the first time offline, in the 1* Village Quest: "Guts- It's What's for Dinner"; Lagiacrus cannot be killed. Its body parts can be broken, and its tail can be carved, but it will only go as far as limping, and cannot be killed until the Urgent Quest in the Village.
- When present in Deserted Island , Lagiacrus will, on rare occasion, leave the water and venture no further inland than Area 5.
- Even if the Lagiacrus' tail is cut or its parts broken in the "Trial of the Sea Dragon" urgent quest, it will return in "Fell the Lagiacrus" healed and unwounded.
- The Lagiacrus is one of the only two monsters in Monster Hunter Tri to have a weapon in every category. The other is Alatreon.
Monster Hunter Generations
- Lagiacrus uses a drastically different set of electrical attacks to compensate for the removal of underwater combat.
- When enraged, thunder will surge around its horns.
- Lagiacrus will prey on Kelbi to recover stamina.
- In G Rank Lagiacrus gains a powerful, short-ranged thunder blast from its mouth. It also taunts less frequently.
Monster Hunter: World
- Lagiacrus was prototyped early in the development of Monster Hunter: World, but was cut from the final game due to animation issues.
- It would have dominated Anjanath in turf wars, like Rathalos.
