Shroom and Gloom Final Boss — Cosmic Horror, Limbs and Guts

The Shroom and Gloom final boss is a multi-phase encounter at the end of the route, and the most documented piece of it is the Cosmic Horror. That enemy's defining rule, reported by a community boss guide, is that every Attack or Skill you play raises the cost of all Attacks and Skills still in your hand, which turns ordinary sequencing into the real puzzle. The game is in Early Access and this is a third-party description rather than a developer one, so the mechanics below are marked to confirm.

What Is Confirmed About Boss Fights

At the level of the official product, the game describes mobs of monstrous mushrooms and hand-drawn dungeons full of fungal foes, and the store lists a single-player Early Access build with Steam Achievements. A community database for that build counts 76 enemies and 34 bosses across 46 encounters, which gives a sense of scale without naming them.

Question	What is known
How many bosses?	34 tracked in one Early Access database
How many enemies?	76, plus 46 encounters
Is there a formal boss list?	Not published by the developer
Does the boss evolve?	The first form evolves on death, per the community guide

• Boss counts come from a build-scoped database, not the developer.
• The route is called the Forgotten Path in the community guide.
• Expect optional and elite fights inside that count.
• Re-check after updates, since Early Access balance moves.

The Final Boss: Cosmic Horror and Guts

The community guide's account of the fight is specific enough to plan around. Killing a limb can drop a Guts card, the first body evolves when it dies, and the closing reward is the Mushroom Key, which opens the Gloom Door. Food matters more than usual because it is not an Attack or Skill, so eating does not trigger the cost increase.

Mechanic	Reported effect
Cosmic Horror	Playing an Attack or Skill adds plus one cost to all Attacks and Skills
Limbs	Separate targets that can drop Guts when killed
Guts	Plus one maximum energy, heal 25, consume
First form	Evolves on death, so its health bar is an opening
Rewards	Mushroom Key, then the Gloom Door

• Decide which expensive card must resolve, then plan the turn backwards from it.
• Food is a safe play while the cost spiral builds.
• Do not clear limbs automatically; take one when you need energy or healing.
• Newly drawn cards can be the way out of an over-costed hand, per the guide.
• Community reports also note early-access shortcuts that trivialised the fight, so verify the current build.