Monster Hunter World (MHW)

One Helluva Sinus Infection Quest and Rewards

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This is a guide for One Helluva Sinus Infection, a Quest appearing in Monster Hunter World (MHW). Learn about One Helluva Sinus Infection's availability, unlock conditions, target Monsters, and rewards for completing the Quest here.

One Helluva Sinus Infection Basic Information

How to Unlock One Helluva Sinus Infection

Clear the quesst "The Encroaching Anjanath".

Quest Basic Information

Lv ★4 Destination Ancient Forest
Type  Optional Research Points  280
Time Limit  50 minutes Reward Money 4320z
Objective Hunt an Anjanath
Other Conditions  HR4

All Low Rank Optional Quests

Monsters Appearing in One Helluva Sinus Infection

Name Starting Area Visited Areas Rest Spot
RathalosRathalos 16 1 / 5 / 8 / 14 / 16 16
AnjanathAnjanath 2 / 10 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 13
Great JagrasGreat Jagras 2 1 / 2 / 3 / 4 2
Tobi-KadachiTobi-Kadachi 14 5 / 11 / 12 / 14 / 15 14

Ancient Forest Maps and Materials

Monster Weaknesses

Monster Fire.png Water.png Thunder.png Ice.png Dragon.png
Rathalos ImageRathalos ★★ ★★★
Anjanath ImageAnjanath ★★★ ★★ ★★
Great Jagras ImageGreat Jagras ★★★ ★★ ★★
Tobi-Kadachi ImageTobi-Kadachi ★★ ★★★ ★★

One Helluva Sinus Infection Rewards

Main Rewards

Item Appearance Rate
Armor Sphere+ 1%
Ancient Bone 16%
Bitterbug 12%
Honey 15%
Machalite Ore 11%
Monster Bone L 28%
Monster Bone M 17%

Monster Materials

Rathalos

Rathalos Shell Rathalos Marrow
Rathalos Tail Rathalos Webbing
Rathalos Plate Rathalos Scale

Anjanath

Anjanath Plate Anjanath Scale
Anjanath Fang Anjanath Pelt
Anjanath Tail Anjanath Nosebone

Great Jagras

Great Jagras Scale Great Jagras Hide
Great Jagras Mane Great Jagras Claw

Tobi-Kadachi

Tobi-Kadachi Claw Tobi-Kadachi Electrode
Tobi-Kadachi Membrane Tobi-Kadachi Pelt
Tobi-Kadachi Scale

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