Mega Crit has taken the unusual step of pulling an entire boss fight out of the Slay the Spire 2 beta branch. In beta patch v0.105.0, Doormaker has been replaced by a new Act 3 boss called Aeonglass.
The change is notable because Doormaker had become one of the sequel's most divisive early access encounters. The reworked version of the boss pushed players through several restrictive effects, including pressure on card draw, card use and energy, which made some deck archetypes feel boxed out before the fight even started.
Mega Crit's explanation is blunt. The studio said Doormaker had "interesting micro decisions in the fight" but was "over the complexity threshold" it wanted, with lingering issues that made a clean replacement the better option.
"Doormaker has been replaced with a brand new boss, Aeonglass! While Doormaker had interesting micro decisions in the fight, he was over the complexity threshold of what we want and had lingering issues. We decided that starting over fresh will let us hit what we actually want for an Act 3 boss."
Aeonglass arrives on the beta branch first
The replacement is currently part of Slay the Spire 2's optional beta branch, not a guaranteed live-build change yet. Mega Crit notes that beta branch updates are pushed there first for stability, then eventually merged into the main branch once the studio is ready.
That makes this a clean early access experiment: Doormaker remains in the main build until the beta changes graduate, while beta players can test Aeonglass and send feedback before the swap becomes wider.
Patch v0.105.0 is not only a boss swap. It also adds the Bestiary to the Compendium, where players can review monsters they have encountered, although Mega Crit says the feature is still an outline of what it will become. The update also includes balance changes for Silent, Regent and Defect, new Neow relics, audio additions for Soul Fysh and Kaiser Crab, localization fixes and a long list of bug fixes.
Several fixes target stability and multiplayer, including save corruption after a crash or power outage, a black screen softlock when Steam disconnects during room transitions and state divergence tied to Mad Science, Juggling and mixed combat speeds.
Mega Crit is slowing Slay the Spire 2 patches
The same Steam post also confirms a broader cadence change for Slay the Spire 2. Mega Crit says it is moving to a two-week patch schedule instead of weekly updates, giving the team more time to polish larger changes and giving beta players more time to absorb updates before the next round arrives.
Slay the Spire 2 launched in early access on Steam on March 5, 2026. The Steam page describes it as a returning roguelike deckbuilder with solo play, four-player co-op, new cards, relics, enemies and more content planned throughout early access.
For now, the biggest player-facing shift is simple: one of the game's most complained-about boss designs is being reset, not just tuned. Whether Aeonglass sticks will depend on how the beta branch responds.