The apex predator of the Oilwell Basin region in Monster Hunter Wilds is an ancient monster called the Black Flame, or Nu Udra. You must take down this beast to ensure it doesn’t threaten the village.
Monster Hunter Wilds Nu Udra Boss Fight Guide

Known Habitats: Oilwell Basin
Breakable Parts: Head and Arms
Recommended Elemental Attack: Water
Effective Status Effects: Poison (2x), Sleep (2x), Paralysis (1x), Blastblight (1x), Stun (2x), Exhaust (2x)
Effective Items: Pitfall Trap, Shock Trap
Attack the Tentacles
Nu Udra is a formidable opponent in Monster Hunter Wilds. Its massive tentacles give it an extensive reach, making evasion difficult. However, these limbs are the most accessible targets for melee weapon users. While you can sever its arms to obtain additional crafting materials, be cautious—they also serve as powerful offensive tools for the creature.
Aim for the Mouth
Ranged weapon specialists have more tactical options available. The most vulnerable point to target is its mouth, though this can be challenging to locate due to Nu Udra's nearly pitch-black exterior.
We still recommend focusing on the mouth, as it possesses a 4-star weakness rating. The head presents another viable target, though it only has a 3-star weakness to projectile damage. Nevertheless, it remains an excellent spot for both blunt and cutting damage.
Use Watermoss
As you've likely observed, Nu Udra exhibits strong fire affinity in Monster Hunter Wilds. Beyond physical strikes with its limbs, it can unleash fiery attacks. During the battle, the creature may engulf itself in flames, creating a hazardous aura that inflicts Fireblight on nearby hunters. Deploy Watermoss projectiles to extinguish these flames, allowing you to engage safely without suffering the debilitating status effect.
Wear Fire Resistant Gear
If you're finding this encounter challenging, equipping gear with fire resistance is highly advisable. The Quematrice armor set comes recommended for its inherent Fire Resistance skill.
You can further enhance your defenses by socketing decorations that mitigate elemental damage. The Fire Res Jewel directly reduces fire damage taken, while the Stream Jewel boosts your offensive capability through its Water Attack enhancement.
Beware of Grab Attacks
Nu Udra employs numerous dangerous techniques in Monster Hunter Wilds, but its most perilous maneuver is the grappling attack. At close range, the monster may attempt to ensnare you with its tentacles. After a brief immobilization period, it will direct a concentrated stream of fire toward your position. During this capture state, rapidly use your carving knife to break free, or have allies target its weak points with Slinger shots.
Related: Monster Hunter Wilds Weapon Tier List (Best Weapons to Use)
How to Capture Nu Udra in Monster Hunter Wilds

To capture Nu Udra in Monster Hunter Wilds, come prepared with either a Pitfall Trap or Shock Trap. However, you cannot deploy these immediately. First, you must weaken the creature through sustained combat until it nears defeat. Monitor the boss icon for a skull symbol, which indicates the optimal time for trap placement.
While using bait meat can lure the monster toward your trap, simply positioning yourself behind the deployed trap while maintaining aggression also proves effective. Once captured, immediately administer Tranquilizers to sedate the creature. You have approximately five seconds before the monster breaks free from the restraint.
This covers all essential strategies for both defeating and capturing Nu Udra in Monster Hunter Wilds. This monster presents a significant challenge solo, so consider utilizing multiplayer assistance to overcome it.
Monster Hunter Wilds is available now on PlayStation, Xbox, and PC.