Slay the Spire 2 Steam Workshop: How to Install Mods (Major Update 2)

Mods Are Official Now

Before June 19, modding Slay the Spire 2 meant manually downloading files and dropping them into a mods folder. Major Update 2 changed that. The v0.107.1 patch added official Steam Workshop support, so installing mods is now a one-click affair through Steam.

Here’s the part that surprised people: the game already had a built-in mod loader since launch. Mega Crit just hadn’t publicized it, because they knew it still needed work. Major Update 2 is them flipping the switch and making it official, though they’ve called the current implementation a little barebones. Expect it to improve over the coming patches.

How to Install Mods

The process is the standard Steam Workshop flow:

1. Open your Steam Library and select Slay the Spire 2.
2. Go to the Workshop tab on the game’s store/library page.
3. Find a mod you want and click the green Subscribe button. Steam downloads it in the background.
4. Launch the game and open the Mods menu.
5. Check the box next to each mod to enable it.
6. Restart the game so it can compile the mods. Slay the Spire 2 runs on Godot, and enabled mods get compiled on startup, so a restart after toggling is normal.

Your subscriptions sync across devices automatically, so if you climb on a desktop and a laptop, your mod list follows you. To remove a mod, unsubscribe in the Workshop and it stops loading.

A Few Things to Check Before You Subscribe

Multiplayer compatibility. Co-op is part of Slay the Spire 2, and not every mod plays nicely with it. Some mods explicitly ship a multiplayer-safe version; others will desync or refuse to connect. If you play with a friend, both of you generally need the same mods, and you want the MP-safe variants. Read the description.

Achievements and “fairness.” Mods that change gameplay, like adding cards or altering rules, may disable achievements or feel like cheating in ranked-style climbs. Pure information and visual mods are the safe zone if you care about a clean run.

Early Access churn. Slay the Spire 2 still updates often. A mod that works on v0.107.1 can break on the next patch until its author updates it. If a mod suddenly causes crashes after a game update, disable it and check whether it’s been updated.

What’s Worth Installing

The Workshop catalog for Slay the Spire 2 is young, so the smart move right now is to sort by subscriber count and recent updates, and read descriptions rather than chasing names. That said, here’s the kind of thing to look for, with one verified example.

Quality-of-life packs. These are the safest first installs. A good example is BetterSpire2, a lightweight QoL pack that ships in a full version and a multiplayer-safe Lite version. It adds things like a damage counter, expected HP readouts, multi-hit totals, and badges for cards that play twice (think Echo Form effects). It started life on Nexus Mods and is the type of utility pack most players want.

Information mods. Anything that surfaces hidden math, like total Block at end of turn, draw-pile odds, or detailed enemy intent damage, makes the game easier to learn without changing the rules. These are great for players pushing into A10, the current ascension cap.

Visual and convenience tweaks. Faster animation modes, colored map nodes, and reward-skip hotkeys speed up runs without affecting balance. Low risk, high comfort.

One mod you don’t need anymore: the community Silken Tress Backport. That mod existed to pull the relic from the beta branch onto stable. Since Major Update 2 shipped Silken Tress natively, the backport is deprecated and disables itself on v0.107 and later. If you see it floating around, skip it.

A Word of Caution

Only install mods from sources you trust, and read the comments and ratings before subscribing. Steam Workshop vetting helps, but a mod that crashes your save or corrupts a run is still a possibility in a young modding scene. Start with one or two QoL mods, confirm your game runs clean, then expand from there.

For everything else that landed in this patch, see our Major Update 2 patch notes breakdown. If you’re modding to study the game, our hidden mechanics guide and keywords guide explain the systems those information mods surface. New players should start with the beginner’s guide.