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Diablo 4 Season 15 Rune Farming Guide | Capstone Dungeons, Kurast Undercity, and More

Sep 28, 2026 Author: D4gold

Diablo 4 Season 15 is a nostalgic season that not only brings back some Diablo 3 gear but also introduces a Runeword crafting system similar to Diablo 2. These runes can be socketed into rune slots, and they can also be used directly to craft Runeword items.

Whether you plan to craft Runeword items or Mythic items, you will need runes first. Let's take a look at how to farm them in Season of Hell's Legacy.

Diablo 4 Season 15 Rune Farming Guide | Capstone Dungeons, Kurast Undercity, and More

Where Do the New Runes Mainly Come From?

These new runes mainly come from new content, such as Capstone Dungeons. If you are farming for Torches, you will obtain Splinters from each boss, including Diablo Splinter, Baal Splinter, Mephisto Splinter, and more.

They all share the same loot tables, drop Rates, and general rewards. The only difference is that different dungeons provide different Splinters.

To enter Uber Tristram, you will need to complete all of these dungeons. During the process, you will usually pick up plenty of runes. Some may be the original Diablo 4 runes, but most of them will be Diablo II runes.

Since Splinter of Terror, Splinter of Hatred, and other similar items have extremely low drop rates, you will often collect many rare new runes before even entering Uber Tristram.

Among the three dungeons, Baal's Worldstone Fortress offers the fastest clear speed and the highest efficiency, making it the best option for rune farming.

If your character is powerful enough, you can try challenging Pinnacle Capstone Dungeon on Torment 10 difficulty. The monster difficulty here is roughly equivalent to Torment 12.

At this difficulty, Baal has a high chance of dropping Sparks, Mythic items, and various rare runes.

Horadric Cube Rune Upgrades

To support the new runes and Runeword items, new recipes have also been added to Horadric Cube. You can combine lower-tier Diablo 4 runes in Horadric Cube to upgrade them and eventually create Ber and other runes.

Runes have a progression system similar to Diablo II. Early upgrades follow a 3-to-1 combination rule, while later upgrades use a 2-to-1 system and require the corresponding Flawless or Perfect Gems.

However, it is not recommended to waste Flawless Gems trying to obtain these rare runes. While farming in Capstone Dungeons, you can occasionally find them along with Mythic items, Mythic Charms, Seals, and other valuable rewards.

Lair Bosses

If you want to farm a specific rune, you can check the boss drop reference table. Each boss has a selection of runes, usually including one Magic, one Rare, and one Legendary rune.

You also need to select the Lair of Runes node in War Plans for Lair Bosses. After activating this node and defeating the corresponding bosses, opening the reward chest will grant a chance to drop specific runes. The drop is not guaranteed, but the frequency is relatively high.

Kurast Undercity

Diablo 4 Kurast Undercity

Besides Capstone Dungeons, Kurast Undercity is also one of the best locations for farming runes. You need to prepare Lesser Tribute of Harmony, Tribute of Harmony, or Greater Tribute of Harmony, which provide additional rune rewards after completion.

You do not need to upgrade them before use. Regardless of which version you obtain, they can be used directly. Kurast Undercity itself already has a decent rune drop rate, so you can still collect plenty of runes even without using Tribute.

In Kurast Undercity, there is no need to clear every monster. Your goal is to quickly activate Energy Towers and fill the reward bar. Once the reward bar reaches Level 4, you can head directly to the boss. This is much faster than clearing the entire dungeon. Farming on at least Torment 10 or higher is recommended, as rune drops become significantly worse at lower difficulties.

Running Kurast Undercity with teammates can further improve efficiency. Using Tribute of Harmony to add buffs to the final boss helps secure the number of rune drops and greatly increases the chance of obtaining Legendary runes.

All Rare runes obtained during farming still have value. You can use three identical Rare runes at the Jewelry Vendor to create one random rune, with a 15% chance of directly producing a Legendary rune.

War Plans

The most important node in The Undercity War Plans is Gutter Filth node. It gives you a chance to summon Portal Pranksters when activating Beacons, increasing additional drops.

Bauble Day node allows you to trade runes and Gems with gold. This option was not recommended in previous seasons because obtaining gold was too difficult, but earning gold is much easier in Season 15. If you have enough gold available, you can choose this node. Unique Runes are worth around 50 million gold each.

Other Methods

Besides the main methods mentioned above, runes can also drop throughout the world. However, the efficiency is relatively low, so they are better treated as additional rewards while leveling and farming rather than a primary farming strategy.

  • Elite Monsters
  • Helltide
  • Strongholds
  • Whisper Caches

If you are missing a specific rune but do not want to spend time farming for it, you can also trade with other players. Joining some trading groups is recommended, as it makes it easier to find suitable trading partners.

These are the most effective ways to obtain runes in Diablo 4 Season 15. The new rune system is not overly difficult to farm, and hopefully you can collect Runewords you need smoothly.

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