Calamity Biome Chest Error

Calamity Biome Chest Error: Terraria is a 2D action-adventure game quite popular in indie gaming and modding communities. Although there are some differences, the game is quite similar to Minecraft in terms of how the player traverses the world and builds, crafts and fights various enemies.

The game is also quite easy to mod and has hundreds, if not thousands, of mods that add to the already expansive game. In this article, we’re talking about Calamity, a mod for the game that adds hours of endgame content and dozens of enemies and bosses to the game.

Why Does This Calamity Biome Chest Error Happen?

There is no specific reason for this error. There are several things that can trigger the problem, i.a.

  • Bad mod update.
  • Damaged game files.
  • Incorrect installation.

How to fix Calamity Biome Chest Error?

Here are three solutions you can try.

Update Calamity Mod and Terraria

The first thing you ought to do is update Calamity Mod and Terraria if there are updates available for either or both of them. There is a good chance that the developers have fixed the problem on their side and have released a patch to fix the problem among the player base.

Check integrity of Steam game files.

Fortunately, Steam has a built-in feature that checks your game files and reinstalls any files that may be corrupted. Follow these steps.

Step 1: Head over to your Steam library, right-click on Terraria and select Properties.

Step 2: Head over to the Local Files tab.

Step 3: Click on Verify integrity of local files… and let Steam do its thing.

Now run the game again, and it should be running all right.

Reinstall Terraria and Calamity Biome Mod

If the aforementioned fixes don’t work, your best bet is to reinstall the game and mod individually from scratch. Make sure you uninstall Calamity Mod first and then the game. This way, you get a clean uninstall. Once you are sure that all instances and files related to the game have been removed, do the same for the mod and then install them again.

World Generation With Calamity Biome Is Persistently Broken


Latest version, 1.4 stable

operating system




This error affects

Gameplay as a player


So I hope I’m barking up the right tree, and if I’m not, please let me know.

I installed the world generation mod Super Seed Search (world search engine) and couldn’t get it to work and just threw this error:

A problem arose during world generation.

CalamityDungeon Biome Chests

System.NullReferenceException: Object locus is not set to an instance of an object.

At CalamityMod.WOrld.MiscWorldgenRoutines.GenerateBiomeChest(GenerationProgress, GameConfiguration setting) at CalamityMod\WOrld\MiscWorldgenRoutines.cs:line 30

at Terraria.WorldBuilding.WorldGenerator.GenerateWorld(GenerationProgress progress) at tModLoader\Terraria\WorldBuilding\WorldGenerator.cs: line 30

So I disabled Super Seed Search and kept getting the error. I disabled Calamity and the world generation worked, but I want to create a world with Calamity so now I’m stuck. Eventually uninstalled all parts of terraria and mods, deleted the folders and reinstalled them on another device. I can’t tell if the problem is with the tModloader files or the Calamity Mod files. I thought I had clean them all and a new one! installation would solve the problem, but I deleted all user files/documents/mygames/terraria and D:\Program Files (x86)\steamapps\common\tModLoader and D:\Program Files (x86)\steamapps\common\Terraria and D : \Program Files (x86)\steamapps\workshop, but I’m missing something.

Appreciate if you can help!

Log File


Steps to reproduce

Install Calamity Mod

Install Super Seed Search Mod

Attempt to use Super Seed Mod to generate a world


Uninstall all mods

Error persists

Expected Behavior

World generation should return to normal after removing Super Seed Search mod from tModLoader, but it has affected tModLoader and/or Calamity Mod.

Actual Behavior

When using normal world generation with Calamity Mod enabled, getting this error:

A problem was encountered during world generation


System.NullReferenceException: Object reference not set to an illustration of an object.

At CalamityMod.WOrld.MiscWorldgenRoutines.GenerateBiomeChest(GenerationProgress progress, GameConfiguration config) in CalamityMod\WOrld\MiscWorldgenRoutines.cs:line 30

at Terraria.WorldBuilding.WorldGenerator.GenerateWorld(GenerationProgress progress) in tModLoader\Terraria\WorldBuilding\WorldGenerator.cs:line 30

Reproduction frequency

100% of the time since the first instance.

Calamity Biome chests error when creating a new world

Biome chests are hard chests found in the dungeon. The only biome chest currently in Calamity Mod is the Astral Chest. Contains a Heavenfallen Stardisk, plus other various items. While Astral Chests are placed during world creation, they are primarily locked and can only be undone once a certain boss has been defeated. Only one Astral Chest will appear in a given world.

How to open an Astral Chest:

Defeat the Astrum Aureus to open the Astral Chest.

Return to the Dungeon and discovery the Astral Chest. Unlike vanilla biome chests, it does not require a key.

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