If you’ve ever watched a Mythic farming guide in Diablo IV and thought “Getting Resplendent Sparks is the easy part… finding the right runes is the real grind,” you’re not alone. With the Diablo IV: Vessel of Hatred expansion introducing rune-based Mythic crafting, players now need specific runes to craft powerful items like Ring of Starless Skies and other Mythic Uniques. While Sparks are fairly easy to obtain, farming the exact runes you need can feel like a massive grind, which is why some players also choose to buy Diablo 4 Gold to speed up their overall progression. After extensive testing, run tracking, and multiple farming sessions, this guide breaks down the fastest and most efficient methods to farm runes so you can craft your Mythics without relying on pure RNG.

Understanding Rune Farming

Runes only exist for players who own Vessel of Hatred, and they are required to craft Mythic Uniques through the Jeweler’s Rune Crafting system.

Runes drop from several activities including:

· Undercity runs

· Boss farming

· World bosses

· Whispers caches

· Rune upgrading through crafting

However, not all methods are equally efficient. After testing multiple approaches, one method stands out clearly above the rest.

Best Rune Farming Method: Undercity + Tribute of Harmony

The Undercity farming method using Tributes of Harmony is currently the most efficient way to farm Legendary runes.

Why It Works

Undercity runs are:

· Extremely fast (1:45–2 minutes per run)

· Consistent in rewards

· Able to generate additional Tributes through goblin chests

· Less RNG dependent compared to boss farming

Recommended Difficulty

Always run this method on:

· Torment 4

· Testing shows a significant increase in rune quality and drop rate compared to Torment 3.

Undercity Rune Farming Results

After running 10 Tribute of Harmony runs, the results were:

Total Result:

· 8 Legendary Runes from 10 runs 

This is an extremely strong drop rate compared to other activities. Even better, goblin chests inside the Undercity dropped:

· 7 additional Tributes of Harmony 

Meaning only 3 tributes were actually consumed to complete all 10 runs.

How to Speedrun the Undercity

Efficiency is key when farming runes. The goal during these runs is not to clear the dungeon. Instead, focus on filling the reward progress bar as quickly as possible.

Fast Run Strategy

1. Enter Undercity with Tribute of Harmony 

2. Ignore most enemies

3. Move directly to pylons 

4. Activate them and clear the nearby monsters

5. Continue until the reward bar reaches 4/4 

6. Skip remaining enemies

7. Kill the boss

8. Loot runes

9. Reset and repeat

Fast mobility builds are perfect for this. Movement-heavy builds like teleport Sorcerers or whirlwind mobility setups can complete runs in under 2 minutes.

Goblin Spawns in Undercity

Occasionally, you may encounter Treasure Goblins during these runs.

These spawn an additional chest, which can contain:

· More runes

· Additional Tributes of Harmony

However, goblins do not spawn every run, and searching for them can slow down farming. It’s usually better to focus on fast completions.

Alternative Rune Farming Methods

While Undercity is the best method, there are several other ways to farm runes.

Boss Farming Results

Testing was done on three boss types:

Boss farming produced far fewer runes compared to Undercity.

It also takes longer due to:

· Boss travel time

· Summoning costs

· Inventory management

Bossing is still useful for other loot, but not ideal for rune farming.

World Boss Rune Drops

World bosses can drop runes as well.

During testing:

· 1 Legendary rune dropped from a World Boss

· 1 Tribute of Harmony was also obtained

This makes them a nice bonus, but not something you should rely on for consistent farming.

Farming Tributes of Harmony

Since Tributes are required for the best rune farming method, you’ll need a reliable way to obtain more. The best source is Tree of Whispers caches.

Completing Whisper objectives rewards:

· Whisper Caches

· Bonus Gift of the Tree containers

These caches frequently drop Tributes of Harmony, fueling even more Undercity runs.

Rune Crafting and Upgrading

After collecting large amounts of runes, you can upgrade them at the Jeweler.

The system works like this:

· 3 runes → 1 upgraded rune 

· Higher-tier runes increase the chance of producing Legendary runes 

Example Craft Results

During testing:

· 4 rare rune crafts produced 2 Legendary runes 

· Additional crafts produced several more high-tier runes

This makes rune crafting an excellent way to convert excess runes into Legendary ones.

Important Warning Before Crafting

Before upgrading or trading runes, check the materials required for your Mythic crafting recipe.

At the Jeweler:

1. Go to Mythic Uniques 

2. Select the item you want

3. Click Show Materials 

This lets you see the exact runes required. If you accidentally trade away required runes, you’ll need to farm them again, which can slow your progress significantly.

Final Rune Farming Strategy

For the fastest Mythic crafting progress:

1. Farm Tributes of Harmony 

o Tree of Whispers

o Goblin chests

o World bosses

2. Run Undercity on Torment 4 

3. Speedrun the dungeon

o Activate pylons

o Fill reward bar

o Skip unnecessary enemies

4. Upgrade extra runes through Jeweler crafting 

Following this loop gives the highest rune-per-hour efficiency currently available.

Final Thoughts

Rune farming can initially feel overwhelming in Diablo IV’s Vessel of Hatred expansion, but with the right strategy, it becomes much more manageable. Right now, the Tribute of Harmony Undercity farming loop stands out as the clear winner for players aiming to craft Mythic Uniques efficiently. With fast runs, strong drop rates, and the ability to recycle runes through crafting, this method allows you to target the Mythics you want without relying entirely on RNG. For players looking to accelerate their progression even further, many also explore trusted marketplaces offering Diablo IV Items for sale, where platforms like MMOEXP provide a wide selection of gear, materials, and services to help adventurers prepare for endgame challenges more efficiently. Happy farming—and may your next run drop the rune you’ve been hunting.