In Diablo 4 Season 15, the most iconic runewords from Diablo 2 have quietly returned. Classic runewords like Enigma, Grief, Spirit, and Call to Arms can now be crafted using Horadric Cubes. This means that runes have transformed from relatively peripheral auxiliary materials into core resources that determine the build's potential.
Without enough runes, you can't achieve Enigma's near-permanent teleportation ability, nor can you experience the significant damage boost from Grief and Spirit. Therefore, knowing how to efficiently farm runes in Season 15 has become an essential skill for every player.
Preparation Before Farming: Splinter of Lies and War Plans

Before discussing specific farming locations, there's an easily overlooked but crucial preparation: equipping a Splinter of Lies.
As a new item added in Season 15, many players might overlook the function of this shard - it increases the drop rate of crafting materials, thus increasing the chances of obtaining runes.
Meanwhile, the choice of War Plan nodes will significantly affect your rune yield. If you're focusing on Kurast Undercity, it's recommended to invest your War Plan points in Gutter Filth node to obtain more chests.
If you prefer farming Lair Bosses, you need to activate Lair of runes and high-value Nemesis-related nodes to ensure that high-value runes appear more frequently in Lair Boss drop pool.
Rune Farming Locations
Kurast Undercity

Kurast Undercity is a relatively stable and controllable location for obtaining runes in D4 Season 15. After entering Undercity using a Tribute of Harmony, each run can typically yield a stable 5 to 10 runes, and the type of rune dropped can be targeted to some extent by Tribute type.
Kurast Undercity's advantage lies in its fast pace and fixed routes; a single run often only takes one to two minutes, making it ideal for frequent, repeated farming. Combined with War Plan node enhancements, you can accumulate a large number of low- to mid-tier runes here, which can be used for Horadric Cube upgrades.
Prime Evil Pinnacle Dungeons
Baal, Diablo, and Mephisto Pinnacle Dungeons, newly added in Season 15, are among the best places to obtain high-value Diablo 4 runes. Of the three, Baal's Worldstone Keep is the most efficient overall - fast map clearing, high rune drop rate, and a large amount of Royal Gem, which can be used in Horadric Cube rune upgrade recipes.
It's worth noting that Baal reliably produces Tal and Eth, the crafting materials for Stealth and Holy Thunde runes respectively, which are crucial for early build development.
Whimsyshire

Whimsyshire's return in Season 15 is currently the most exciting new option for rune farming. Liquid Rainbow opens a rainbow portal to Whimsyshire.
Obtaining Liquid Rainbow is straightforward: you receive one as a reward for progressing through Season Journey to Rank 5, and it may also appear randomly as a world drop.
Once in Whimsyshire, the core farming objective is to exploit Happy Clouds scattered throughout the map. Clicking on these clouds releases a large amount of loot; a single run can yield a substantial number of runes, including Tal, Ist, Mal, Ith, and Sol, often in greater quantities than one or two.
In addition, interactive objects like Candy Jar and Soup Chest provide extra drops, while the final boss, Neigh'relle, drops unique Charms and other valuable materials. It's recommended to set the game difficulty to the highest level you can handle to maximize loot quality.
Lair Boss
If your goal is to reach higher runes, then Lair Boss is another route worth investing in long-term. Unlike Kurast Undercity, which focuses on stable, high-volume rune rewards, the advantage of Lair Bosses lies in their high-value loot pool.
Furthermore, in Diablo 4 Season 15, Lair Boss's War Plans introduced a crucial Lair of runes node - unlocking it allows the boss to drop additional runes.
This means that farming Lair Bosses isn't just about gear - once you're able to consistently farm high-difficulty bosses, each run can simultaneously yield unique, Mythic items, and high-tier runes.
Rune Upgrades and Conversions
While getting the runes you need directly is exciting, rune drops in Season 15 still have a significant element of randomness. Therefore, mastering the rune upgrade recipes from Horadric Cube is an essential skill for every player.
Diablo 4 S15's Horadric Cube provides a complete targeted upgrade chain:
- 3 × Tir → Eth
- 3 × Eth → Ith
- 3 × Ith → Tal
- 3 × Tal → Ral
- 3 × Ral → Ort
And so on, sequentially through Thul, Amn, Sol, up to Mal, Ist, Vex, Ohm, Lo, Ber, Jah. This means that even if you haven't obtained Ber or Jah yet, you can systematically collect lower-tier runes and gradually upgrade them to approach your goal.
Furthermore, Horadric Cube supports merging 5 Rare runes into 1 Legendary rune. Although the result is random, this is a reliable way to obtain higher-tier runes.
Whether you directly obtain your target rune or gradually upgrade by accumulating lower-tier runes, mastering these methods will eventually allow you to obtain the runes you want and create your desired runeword.














