Welcome to this detailed guide on how to install and use mods for Slay the Spire! If you’ve ever been curious about expanding your Spire experience with custom characters, new relics, or gameplay tweaks, this walkthrough will get you up and running with everything you need.

---

1. What You’ll Need

Before jumping in, here are the essential tools:

• Slay the Spire (Installed via Steam)
• Access to the Slay the Spire local files
• Downloads for the following mods:
  • BaseMod (required for most mods to work)
  • ModTheSpire (mod launcher)

You’ll find these files through their respective GitHub pages. Be sure to download both the .jar file and the source code (zip) for each.

---

2. Locating Your Slay the Spire Folder

1. Open Steam.
2. Navigate to your Library.
3. Find Slay the Spire, right-click, and select Properties.
4. Go to Local Files > Browse.

This opens your Slay the Spire installation directory. You’ll be working here for the remainder of this setup.

---

3. Setting Up ModTheSpire and BaseMod

Download the following files:

• From BaseMod:
  • .jar file (e.g. BaseMod-2.15.jar)
  • .zip source code
• From ModTheSpire:
  • .jar file
  • .zip release folder (e.g. ModTheSpire-2.7.zip)

Now follow these steps:

1. Move all downloaded files into your Slay the Spire directory.
2. Right-click on each .zip and choose Extract Here.
   • This creates folders named BaseMod-2.15, ModTheSpire-2.7, etc.
3. Create a new folder named mods (lowercase) in your Slay the Spire directory.
4. Move the .jar files into the mods folder.
5. Keep the corresponding unzipped folders inside the mods folder too.

At this point, your directory structure should look like this:

Slay the Spire/

├── ModTheSpire.jar

├── /ModTheSpire-2.7/

├── /mods/

│   ├── BaseMod-2.15.jar

│   └── /BaseMod-2.15/

---

4. Installing Additional Mods (e.g., Custom Characters)

To install a new mod, such as the Witch character:

1. Go to the mod’s GitHub (linked on modding community sites).
2. Download both the .jar file and .zip folder for that mod.
3. Place the .jar file inside the mods folder.
4. Extract the .zip folder contents inside the mods folder as well.

Repeat this process for every mod you want to install.

---

5. Launching the Game with Mods

To run your modded Slay the Spire:

1. Navigate to the ModTheSpire.jar file in your main folder.
2. Double-click to launch.
3. A mod menu will open—make sure BaseMod is selected.
4. Check any other mods you’ve installed.
5. Click Play.

The game should launch normally but now with a Mods menu in the main interface. All loaded mods will be displayed here.

---

6. Common Issues & Tips

• Beta Version Warning: Make sure your Slay the Spire installation is NOT using a beta branch. Opt out via Steam > Properties > Betas.
• Updates: Mods can break with game updates. Bookmark your mods’ GitHub pages to grab the latest versions.
• Organization: Keep .jar files outside the folder but inside mods; corresponding folders go inside mods.
• Don’t Touch Internal Mod Files: Leave all extracted folders as they are.

---

7. Final Notes

Modding Slay the Spire enhances replayability tremendously. From full-fledged characters to quality-of-life tools, the community has created hundreds of options to tailor your experience.

If you encounter any errors, drop questions in the community forums or YouTube comment sections—people are generally quick to help.

Enjoy experimenting, and may your modded Spire runs be filled with glorious chaos!