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Play on SteamWhat Is Corpus et Spiritus?
Corpus et Spiritus is a roguelite deckbuilder built around a grim bargain. You signed a pact with a Homunculus, a demon that teaches you alchemy in exchange for your life force. Every run is a race: learn the art faster than the demon drains you, and find a way out of the contract before it kills you. There is no combat. You never swing a sword or cast a fireball at an enemy. Your fights are against resource curves, bad drafts, and your own greed.
The workshop is the heart of the game. You gather rare metals, feed them into your alchemy stations, and transmute them into cards and magical talismans. What comes out depends on what you put in, so the metals you carry are a form of deck control that most deckbuilders simply don't have. Cards come from seven families split across body, mind, and soul, and combining cards with talismans is where the big turns happen.
It launched on November 3, 2026 for $12.49, with a 25% launch discount bringing it to $9.36 until November 13. The game is published by Firesquid (with Gamersky Games co-publishing in China) and developed by Arpentor Studio, a two-person team from Lyon, France whose previous game was the city-builder deckbuilder Dawnmaker. Nine interface languages ship at launch, including Simplified and Traditional Chinese, Japanese, and Korean, which tells you where the publisher expects the audience to be.
| Fact | Detail |
|---|---|
| Developer | Arpentor Studio (Lyon, France) |
| Publishers | Firesquid, Gamersky Games |
| Genre | Roguelite alchemy deckbuilder, no combat |
| Release | November 3, 2026 |
| Price | $12.49 (launch -25% → $9.36, ends Nov 13) |
| Platforms | Windows, Linux (Steam) |
| Players | Single-player |
| Card families | 7, across body / mind / soul |
| Languages | EN, FR, DE, ES, RU, JA, KO, ZH-S, ZH-T |
| Steam features | Cloud saves, Family Sharing |
| DLC | Supporter Pack ($4.99) |
| Achievements | None at launch |
The Core Loop
A run moves through three connected systems, and understanding how they feed each other is the difference between a deck that stalls in hour two and one that snowballs.
1. The pact. Before a run starts you customize your contract with the Homunculus, selecting boons and challenges. Boons help you; challenges hinder you and shorten your clock. Each choice moves you closer to or further from breaking the pact. Treat this screen like a difficulty dial you also tune for rewards, not a loadout screen. A run stacked with challenges needs a payoff plan.
2. The workshop. Between encounters you bring metals back and transmute them. The metals you insert change what the station offers you, which the developers call "controlled randomness." You are not drawing from a fixed card pool and praying. You steer the pool. This is the single most important mechanic in the game and the one that separates it from Slay the Spire-style drafting.
3. Your three resources. Health, wits, and stamina all sit on the same ledger, and the Homunculus eats them. Cards tax one or more of these pools. A card that costs wits is a card you pay for with your ability to keep experimenting. Running one pool dry has different consequences than running another dry, and late runs punish players who only watched their health bar.
Getting Started: The First Three Runs
- Don't spend life force early. The Homunculus offers trades: your vitality for power. Early in a run those trades look cheap because your clock feels long. It isn't. Take the free metals and card options first, and treat life-force trades as a late-run accelerator once you know how your deck wins.
- Pick metals for the deck you want, not the deck you have. Because the workshop output depends on your inputs, hoarding a metal you never transmute is wasted bag space. Decide within the first two stations whether you're building toward a body-family, mind-family, or soul-family strategy, then feed that plan.
- Read the challenge text on the pact screen twice. Challenges are not cosmetic. A challenge that taxes wits directly nerfs every experiment you run. If a boon looks strong but the attached challenge hits your main resource, the deal is worse than it reads.
- Build talismans around your best card, not your average card. Talismans combine with cards for amplified effects. One talisman glued to a genuinely strong card outperforms two talismans spread across filler.
- Die on purpose once. Your first loss unlocks knowledge: which stations exist, what the Homunculus demands, where the run actually ends. The game rewards experimentation explicitly, so a throwaway run spent mapping the systems is not a wasted run.
- Watch the token track. Breaking closer to the pact earns tokens that unlock new alchemy stations and secret cards. Tokens persist across runs, so every failed attempt still moves your meta-progression forward. Losing is budgeted into the design.
Common Early Mistakes
| Mistake | What actually happens | Better habit |
|---|---|---|
| Grabbing every boon | Challenges stack into an unwinnable clock | One strong boon per run |
| Transmuting reactively | Random-feeling card pool | Transmute toward a chosen family |
| Ignoring wits and stamina | Run dies without health reaching zero | Spend all three resources on purpose |
| Hoarding metals | Bag full, deck empty | Metals are fuel, not treasure |
| Treating it like StS | Drafting for immediate turns | Draft for what the workshop can make |
Advanced Tips: Deck Families and Pact Builds
Seven card families is a lot to juggle, and the game splits them under three pillars. You do not need to know every family's identity on day one, but you should know which pillar you're funding:
- Body builds lean on physical resilience and stamina manipulation. They suit players who want a slower, tankier run where the Homunculus has to work for every point of life force.
- Mind builds scale with wits and experimentation. The more you transmute and test, the stronger the deck gets. This is the highest-skill family because your resource ceiling is your experimentation budget.
- Soul builds revolve around talismans and pact interactions. They lean hardest into the game's unique systems, and they pair well with aggressive pact customization because the pact itself becomes part of the combo.
Whichever pillar you choose, the metal economy is the same: metals in, options out. A strong run usually looks thin on cards in the early game because the player transmutes rarely and deliberately, then explodes in the mid-game when three or four crafted cards land in one station visit. If your deck feels weak at hour one of playtime, the fix is almost never "add more cards." It's "feed the workshop with better inputs."
For pact customization, match your challenge selection to your resource plan. A stamina-positive challenge hurts a body build far less than a wits-positive one hurts a mind build. Since breaking the pact early is the win condition embedded in the design, runs that stack mild challenges for extra progress tend to outperform safe runs over multiple attempts.
Progression and Unlocks
Runs feed a persistent token economy. Getting closer to breaking the pact earns tokens, and tokens unlock new alchemy stations and secret cards. That loop gives the game a structure most deckbuilders lack: the workshop you used in run one is not the workshop you'll use in run ten. Each new station changes what metals are worth hoarding, which reshuffles which card families are strong.
The Supporter Pack ($4.99) is cosmetic support for the studio, not a content gate. Everything gameplay-relevant is in the base game. Steam Cloud saves are supported, useful if you play across two machines, and there are no Steam achievements at launch, so progress tracking runs entirely through the pact-breaking meta-progression.
How It Compares
- vs Slay the Spire: No combat encounters at all, and card acquisition runs through crafting rather than post-fight rewards. If StS is poker, Corpus et Spiritus is closer to cooking with a recipe book you're still writing.
- vs Cultist Simulator: Shared flavor of occult knowledge bought with your own body, but much more structured. You always know what a turn does.
- vs Dawnmaker: Arpentor's first game blended city-building with deck mechanics. This one drops the board entirely and goes all-in on the crafting loop.
Developer Background
Arpentor Studio is Adrian Gaudebert and Alexis, a two-person studio in Lyon that has documented its entire commercial history in public: the wrong market research, the real Dawnmaker revenue numbers, the production costs, the post-mortem. The studio ran open playtests for Corpus et Spiritus through 2025 and posted the origin story of the game's concept on Adrian's blog before the Steam page even went live. Firesquid, the publisher behind a steady line of mid-size indie strategy games, handles distribution, with Gamersky Games co-publishing for the Chinese market. If you buy the game and want to know exactly what your money funds, this is one of the few studios that will tell you to the dollar.
FAQ
Is Corpus et Spiritus combat-free? Yes. There are no enemies to defeat. Tension comes from the life-force clock, resource management, and pact terms.
How long is a run? The studio hasn't published a fixed number. Expect deckbuilder-standard session lengths, with meta-progression tokens making each subsequent run meaningfully different.
Does it have achievements? Not at launch. The pact-breaking token system serves as progression tracking.
Linux support? Yes, unusual for a deckbuilder at this size. Windows and Linux both ship at launch.
What does the Homunculus actually do to me? It consumes your health, wits, and stamina in exchange for power. Let it eat too much and the run ends on the demon's terms instead of yours.
Is the launch discount worth waiting for? No. It ends November 13, so buy before then if you're buying at all.
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