Slay the Spire 2 Major Update 2 (v0.107.1): Everything That Changed

The Short Version

On June 19, 2026, Mega Crit shipped Slay the Spire 2 version 0.107.1, branded as Major Update 2. It’s a big one. There’s a new Act 3 boss, official mod support, a Bestiary, three new starting relics, a genuine fix to the game’s randomness, and a long list of balance changes with Regent as the headline winner.

This is still Early Access, so the ascension cap stays at A10. If you’re climbing, that’s still your ceiling for now.

Here’s everything that matters, grouped so you can find what you care about.

New Act 3 Boss: Aeonglass

The headline. Doormaker is gone, fully removed from the game, and Aeonglass takes its place as the Act 3 boss. Mega Crit said Doormaker had interesting decisions but sat over the complexity threshold they wanted, with lingering balance issues, so they started over.

Aeonglass works on a Wither mechanic. Wither is a 1-cost Status card with Retain that deals 2 damage at the end of your turn if it’s still in your hand, and the boss keeps handing you more as the fight goes on, with the damage scaling up. The practical result is that Aeonglass is a kill race. We have a full breakdown in our Aeonglass boss guide.

Three New Neow Relics

The first-screen blessing pool grew by three:

• Silken Tress: Enchant all cards in your first card reward with Glam. Upon pickup, lose all gold. Glam gives a card Replay once per combat.
• Kaleidoscope: Upon pickup, gain 2 card rewards with cards from other characters.
• Fishing Rod: Every 3 normal combats, upgrade a random card in your deck.

Silken Tress in particular has gotten a lot of attention. Full effects and a tier read are in our new Neow relics guide.

Steam Workshop Support

Slay the Spire 2 now has official Steam Workshop integration. You can browse and install community mods directly through Steam’s interface with a click, and your subscriptions sync across devices automatically. Under the hood, the game already shipped with a mod loader; Mega Crit just held off announcing it until it was ready.

The team called the current implementation a little barebones, so expect it to grow. We cover installation and a few mods worth trying in our Steam Workshop mods guide.

New Bestiary

The Compendium now has a Bestiary. It tracks the monsters you’ve encountered and lets you view their moves and animations. Future updates are planned to add enemy stats and lore. It’s a quality-of-life and reference feature rather than a gameplay change, but it’s genuinely useful for studying enemy intents.

The RNG Rework

This one is bigger than it sounds. Players had long complained about getting certain results too often, like Debt showing up from Neow’s Bones. It turns out they were right. The old random number generators were correlated with each other despite using separate seeds, and some outcomes were skewed by region.

Mega Crit replaced the implementation with xoshiro256**, and the result is randomness that’s evenly distributed with no human-detectable correlation. Your runs should feel fairer now, even if the game overall plays a touch harder.

Regent Buffs

Regent is the clear balance winner this patch. The changes:

• Parry (reworked): Sovereign Blade now gains 10(14) Block directly, affected by Dexterity and Frail.
• Sword Sage (reworked): Sovereign Blade gains Replay 1.
• Astral Pulse: Damage changed to 6(8) x2.
• Crescent Spear: Base damage increased 6 to 8.
• Royalties: Gold gain increased 30(35) to 30(40).
• Furnace: Forge increased 4(6) to 5(7).
• Monarch’s Gaze: Energy cost decreased 3(2) to 2(1).
• Reflect, Bulwark, and Patter received Block reductions, and Minion Sacrifice was toned down.

Numbers in parentheses are the upgraded version. The net effect is a much stronger Forge path. Our post-buff Regent build guide goes deep on how to use these.

Enemy Reworks and Other Balance Changes

A handful of enemies got reworked or retuned:

• Infested Prism (Hive): Completely reworked. It now taints your skill cards so the damage you take increases with each card you play, which forces aggressive, efficient turns instead of long card-spam.
• Axebots: Consolidated into a single, stronger Axebot encounter.
• Skulking Colony: HP increased 70(75) to 75(80), Hardened Shell increased 15 to 20, Smash move removed.
• Haunted Ship: Now applies 3 Weak on turn 1, Ramming Speed move removed.
• Punch Construct: Attack sequence reordered, now applies Frail instead of Weak.

On the multiplayer side, scaling for the Artifact, Slippery, and Skittish modifiers was reduced across multiple characters.

So, Is the Game Harder Now?

A little, yes. Several enemy changes push you toward faster, cleaner play, and Aeonglass punishes slow decks hard. But the RNG fix means the difficulty feels earned rather than random, which is the trade most players seem happy with.

If you’re coming back after a break, this is a good patch to relearn the game on. For where everything sits now, check our card tier list and patch meta guide.