Slay the Spire 2 Bestiary Secrets — Hidden Interactions and Lore Links

Published 2026-05-09Updated 2026-09-195 min read

The Bestiary and monster lore in Slay the Spire 2: the 1-8 key secret, sequel connections to the original spire, mythology nods behind the design, and what the bestiary tracks.

The Bestiary shipped in the 0.105 patch as the Compendium's new monster index — and it arrived with both an official secret and a growing pile of community-discovered connections between this spire and the original game's cast. Here is what the book actually does, and what's hiding in it.

A monster encounter in Slay the Spire 2
Every monster in the book, and at least one secret the devs left in the margins.

The official secret

Straight from the patch notes: press the 1–8 keys while viewing a monster in the Bestiary. The entry responds — a hidden interaction the developers built in for attentive readers. Try it on your favorite horror before you read any further.

What the Bestiary tracks

The 0.105 version is openly an outline: monster art, animation entries and a listing screen, with full stat blocks and data flagged as still to come. Treat it as the skeleton of a bestiary — the structure ships first, the flesh arrives over Early Access.

The connections players have traced

The spire's cast carries more continuity than its cartoon monsters let on:

  • Legacy monsters return in cameo forms — several original-spire creatures reappear as event scenery and fight cameos, complete with their old silhouettes.
  • Enemy mechanics echo the first game's lessons. Attack patterns veterans remember — big telegraphed singles, multi-hit packs — show up reworked rather than reused.
  • The lore threads run through events more than fights. The lich's Spireborn origin, the Regent's star throne, and the Ancients' hierarchy are where the sequel's actual story lives; the bestiary entries are the footnotes to those.

Why the bestiary matters for runs

Even in outline form, it is a scouting tool. Boss entries preview what the end of each act looks like — and knowing the Act 3 boss is the new hourglass construct, Aeonglass, changes how you draft: hand-pressure answers and block scaling rise in value. The bestiary's real function is letting you prepare for the fights you haven't met yet.

The completionist angle is real too: the index gives the completion-minded a checklist, and the devs have confirmed data, drops and fuller entries will fill in over time. Expect the book to thicken every patch.

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