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- Today, we're diving into one of the most powerful-and somewhat controversial-farming strategies in Diablo 4 Season 9: the Kurast Under City bug. This method allows players to farm legendary runes at a rate that's nearly impossible to match with standard gameplay. In this challenge, I set myself a one-hour timer to see just how many legendary runes I could farm using this trick Diablo 4 Items. The results? Let's just say they were beyond impressive.
Before we get into the step-by-step breakdown, it's worth mentioning that this bug has been around since Season 8 and remains unpatched as of now. Blizzard seems in no rush to fix it, so while it's technically an exploit, the general consensus in the community is that it's safe to use. If you're looking for a fast and efficient way to boost your rune collection, this might be your ticket.
What Is the Kurast Under City Bug?
The bug revolves around abusing a mechanic in the Cave District of Kurast Under City. When certain conditions are met, players can force the final boss to drop loot multiple times in a single run, effectively multiplying the rewards. The key is to die just before the boss dies-a timing trick that teleports you outside the boss chamber but still registers the boss as defeated. When you re-enter, the boss respawns, and you can repeat the kill for more loot.
The bug is most consistent in the Cave District. While the Tikura and Temple Districts exist, neither of them works well for this exploit. As such, I reset the Kurast Under City until I get the Cave District every time. While this approach consumes more Tributes of Harmony, it maximizes rune yields per hour.
How the Method Works
1. Entering Kurast Under City You'll need a Tribute of Harmony to enter the Kurast Under City. Once inside, check if you're in the Cave District. If not, you can either reset (which I do) or complete the district anyway for casual farming.
2. The Boss Room Trick When you reach the final boss chamber, the goal is to time your death so that you die just seconds before the boss goes down. If done correctly, you'll be teleported outside the chamber but still receive loot from the kill. Even better, the boss will respawn, and you can repeat this loop multiple times.
To make this work, I intentionally lower my character's defenses. I unequip boots and remove gems from my jewelry sockets to reduce armor and resistances. I then use the boss's swirling AoE attack to manage my death timing while still dealing damage.
With some practice, you can reliably repeat this cycle 3-4 times before the boss stops dropping loot. After that, it's best to leave, repair gear, and start a new run.
Why Hydra Sorceress Makes It Easy
The introduction of the Hydra Sorceress build in Season 9 has made this exploit much simpler to execute. Instead of juggling both your damage output and incoming damage, you can drop a Hydra and focus solely on your own health management. The Hydra will continue damaging the boss even if you're intentionally letting yourself die. This convenience makes the Cave District method far more consistent compared to Season 8, when timing the exploit was both difficult and unreliable.
Loot Breakdown: 1 Hour of Farming
Over the course of a one-hour challenge, I managed to farm the Cave District boss eight times using the bug. Here's what I got:
8 Legendary Runes, including: 1 M Rune 1 Bach Rune 2 Igny Runes (very valuable for crafting) A full inventory of rare and common runes.
This haul would be nearly impossible to achieve with standard farming methods. On average, a single run through the Cave District with the exploit yielded 2-3 legendary runes, which is several times more than a normal drop rate.
Which Tributes Work With the Bug?
While my runs focused on the Tribute of Harmony, this exploit works with any tribute that influences Kurast Under City bosses:
Tribute of Ascendance Great for farming Mythic Uniques. If you're lucky enough to get the Cave District with this tribute, you can use the bug to multiply your chances of scoring a mythic item.
Tribute of Radiance Ensures the boss drops Ancestral Legendaries. Pairing this tribute with the bug can net you high-end gear faster than any other method.
Obusite Tribute When used with the bug, you can farm Obusite drops multiple times in a single run. This is particularly useful if you're targeting rare crafting materials.
This versatility is what makes the bug so powerful-it's not just limited to rune farming.The Fun Factor
Exploits aren't usually something I recommend, but this one is actually fun to execute. Normally, Kurast Under City bosses are pushovers. With a well-geared character, you could kill them with two button presses, which gets boring fast.
By contrast, this bug introduces an element of strategy:
You have to carefully watch both your health and the boss's health. Timing your death perfectly takes some practice. The risk of failure (losing your chance to duplicate loot) keeps things interesting.
It feels more like a mini-game than a typical farm session, and the payoff is huge.
Efficiency Tips for Farming
If you want to maximize your loot per hour using this method, here are some key tips:
1. Focus on the Cave District This is where the bug consistently works. Reset the Kurast Under City until you get it. While this burns through Tributes of Harmony faster, it's worth it if you're farming seriously.
2. Don't Waste Time on Full Clears Speed is everything. Ignore unnecessary mobs and head straight for the boss. The faster you complete the cycle, the more runs you can squeeze into an hour.
3. Repair Gear Frequently Because you're intentionally dying, your gear will take a beating. Always repair between runs, but don't leave the dungeon mid-run to repair-doing so will close the instance and waste your tribute.
4. Use Hydra Sorceress This is by far the best build for the method. Drop Hydras for consistent DPS on the boss while you manage your death timing.
5. Track Time Between Loops The bug works for 3-4 loops before the boss stops dropping loot. Don't waste time trying to farm beyond that point-just reset and start fresh.
Risks and Blizzard's Response
The big question: Will Blizzard ban players for using this?
Based on everything we've seen, the answer is almost certainly no. This bug has been live since early Season 8, and despite multiple reports on the forums, Blizzard hasn't addressed it. I've personally showcased it in several videos without any repercussions. Until Blizzard officially announces otherwise, this seems like a safe (albeit unintended) farming method.
That said, bugs like this can be patched at any time. If you want to take advantage of it, now is the time.
Final Thoughts
After an hour of farming with this method, I came away with a staggering number of legendary runes and rare crafting materials-far more than I could get with any other strategy in Diablo 4 Season 9. The Kurast Under City bug is hands down one of the most efficient farming methods in the game right now.
Even if Blizzard eventually fixes it, this trick adds an unexpected layer of gameplay to otherwise routine boss fights. The mix of risk, timing, and massive rewards makes it feel both rewarding and engaging Diablo 4 materials.
If you're struggling to gather runes for crafting mythic items or upgrading your endgame build, I highly recommend giving this method a shot. Just remember to:
Use the Cave District. Practice the death timing. Keep your gear repaired.
With some patience and the right setup, you could walk away with 30+ legendary runes in just a few hours.
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