Mhw 4th Farm Slot
The new level 4 decorations in Monster Hunter World: Iceborne (MHW:IB) are broken up into four rarities: Rarity 9 (R9), Rarity 10 (R10), Rarity 11 (R11) and Rarity 12 (R12). Feystones follow a similar pattern in that there are Ancient Feystones (R9), Carved Feystones (R10) and Sealed Feystones (R11). The higher the rarity of Feystone the better the odds of a higher rarity decoration.
Mhw Slot Upgrade 1
For a full list of all decorations you can go here. A bit of scrolling and you'll find the start of the list of level 4 decorations (starts with Fire Res Jewel+).
First and foremost let's go over drop rates starting with Feystone drop rates from Tempered investigations. All drop rate information was taken from here. I'm not going to be including the Feystone drop rates from hunting in the Guiding Lands since the data we currently have for it is rather incomplete.
So I made a simple mini-guide detailing the armor skills and slots of all the (I can currently forge) Armor in Monster Hunter World. There’s also a table of MHW Set Bonuses below it.Similarly, I made a Searchable Elemental Weakness Chart MHW Calc – create and save builds! High-Rank Armor: Skills & Slots. MHW Best Augment Sphere Farm Top 5 Ways Keeping up with your armor spheres for upgrading armor is just as important as keeping up with your zenny in Monster Hunter: World. Armor Spheres are pretty easy to find as long as you are staying busy in active event quests and also keeping up with daily and weekly quests.
| Threat Lvl | Ancient | Carved | Sealed |
| Threat 1 | 70% | 30% | - |
| Threat 2 | 30% | 60% | 10% |
| Threat 3 | - | 60% | 40% |
Then we have the drop rates of decorations by rarity from the Feystones. The percentages below do not add up to 100% since there is a chance you can get the base game decorations from Master Rank Feystones.
| Feystone | Rare 9 | Rare 10 | Rare 11 | Rare 12 |
| Ancient | 33% | 14% | <1% | - |
| Carved | 21% | 37% | 8% | - |
| Sealed | - | 55% | 20% | 3% |
/cdn.vox-cdn.com/uploads/chorus_asset/file/10081049/Monster_Hunter_World_guide_walkthrough_59.jpg "Mhw 4th farm slots")
Mhw 4th Farm Slots
From that information I've put together a quick table on the best methods for farming each of the different rarities of decorations. More information on how go about these methods will be provided below.
| Rarity | Method |
| 9 | Completing T1/T2 investigations |
| Melding Spiritvein Slogbones from GL T1 monsters | |
| Event Quest: 'The Wrath of Thunder Descends' | |
| 10 | Completing T2/T3 investigations |
| Melding Spiritvein Solidbones from GL T2 monsters | |
| Event Quest: 'The Wrath of Thunder Descends' | |
| 11 | Completing T2/T3 investigations |
| Melding Spiritvein Solidbones from GL T2 monsters | |
| Event Quest: 'The Wrath of Thunder Descends' | |
| Event Quests: Supply Cache Tempered Elders | |
| 12 | Completing T3 investigations |
| Event Quest: 'The Wrath of Thunder Descends' | |
| Event Quests: Supply Cache Tempered Elders |
In terms of actually being able to pursue these methods you're going to need to hit certain Master Rank (MR) requirements. If you've completed the main story then, once that MR cap has been removed, your MR will likely be high enough that you'll able to farm T1/T2 investigations. You can either gather tracks/break parts in other hunter's T1/T2 quests online or from one of the T1/T2 optional quests (e.g. this one for T1, this one for T2). You'll also be able to eventually get more T1/T2 investigations in the Guiding Lands.
Spiritvein Slogbones are available for farming once you leveled up a biome in the Guiding Lands to level 4 so that T1 monsters start spawning. Spiritvein Solidbones are available once you get to MR49, complete the assigned quest to remove your MR cap and then level up biomes to level 5 so that some of the T2 monsters start spawning. Once you get to MR69 and remove your MR cap again you'll have full access to all T2 monsters in the Guiding Lands. You can go here to find a full list of what monsters spawn where in the Guiding Lands. Spiritvein Solidbones can also be obtained by melding 6x Elder Spiritvein Bones obtained by hunting T3 Elders in the Guiding Lands (more below).
Jewel Farm Mhw
Mhw 4th Farm Slot Machine
T3 investigations are not available until you've reached MR99 and, once again, removed your MR cap via the assigned quest that you get from reaching that MR level. From there you can gather tracks/break parts in other hunter's T3 quests online, in a Guiding Lands biome that you've leveled up to level 7 or in one of the high MR optional quests (e.g. this one). Keep in mind if you're having trouble completing T3 investigations, and if you can complete two T2 investigations in the same amount of time it takes you to complete one T3 investigation you might be better off just sticking to T2 investigations.