The most broken Ancient City seed ever? An underground empire of 31 cities in a 3k radius, starting with a completely sterile (Warden-free) city right at spawn. [6-Digit Seed]

Version: Java 1.21.1 / Bedrock 1.21.20-41 (Read note below!)

I managed to completely break the world generation math. This gives you the most overpowered, glitchy start I have ever seen. It’s basically a massive underground empire.

Here is the breakdown of this absolute madness:

The Sterile Spawn City & Chain #1: You spawn directly above an Ancient City. But due to a biome bug, the city spawned inside an Underground Plains biome instead of the Deep Dark. It has ZERO sculk, shriekers, or sensors. You can safely sprint through it on Day 1 and loot everything. Just from this first safe city alone, I pulled 5 Enchanted Golden Apples and 16 Potions of Regeneration II. After that, it doesn't matter who or what you face in this world — they won't stand a chance. This city is also the start of a massive 12-city chain with only 200-300 blocks between them, stretching all the way to coordinate 3000!

The Overpowered Spawn Surface: Right above that sterile city is a village. There are 3 MORE villages within just a 400-block radius. The spawn is surrounded by Mountains and a Cherry Grove biome.

The Southern Empire (Chain #2): If you head South, you hit a Desert and a Badlands (Mesa) biome. Directly underneath it? Another insane chain of 12 Ancient Cities back-to-back.

The Northern Frontier: Heading North takes you to cold biomes featuring regular Taiga, TWO variants of Old Growth Taiga, and Ice Spikes. Plus, there are villages generating roughly every 400 blocks. All of this is still within the 3k radius.

But wait, there's more:

• If you explore just a bit further, you'll find a 3rd chain of 7 Ancient Cities.
• Need a safe haven? There are TWO Mushroom Islands nearby: one at [-2000, -1200] and another at [2000, -1500].

Still not easy enough? The Nether is incredibly easy too. Right near spawn, there is a Nether Fortress (120, 120) and a Piglin Bastion (-80, -200). Just a bit further, there is a Treasure Room Bastion (-200, -650) where a Netherite Upgrade is guaranteed. Right next to this Treasure Bastion is a Warped Forest, perfect for farming Endermen before you search for the Stronghold.

The Seed: Here is the seed itself. It's only 6 digits long, making it very easy to remember: 353501

Bedrock Edition Note: I know there are a lot of Bedrock players here who want to know if this works for them. I tested it on versions 1.21.20-41, and yes, it works, but only partially! The biomes are mostly the same, but there are about half as many Ancient Cities and villages overall. However, you still get 6 Ancient Cities near spawn. The coordinates are slightly shifted, and please note: these cities are infected with sculk, so be careful when visiting them!

Bonus: Right next to the spawn village, there is a massive 200×200 meadow where literally NOTHING grows except red poppies. It instantly reminded me of the Wizard of Oz.

I’ve attached the Cubiomes map showing the insane city chains, and in-game screenshots of the bugged Warden-free city (with F3 open). Have fun!