Skull Cavern in Stardew Valley: Floors, Loot, Enemies, and Survival Tips

Stardew Valley sells itself as a cozy farming game, but ConcernedApe also tucked some genuinely brutal places into Pelican Town's map. The Skull Cavern is the worst of them, and it also happens to be where the best loot lives. This guide walks through how to get in, what waits for you, and how to come back out alive.

What the Skull Cavern Actually Is

Think of the Skull Cavern as the Mines on hard mode. You still descend through procedurally generated floors with worse monsters on each one, but two key things change.

First, there is no elevator. Every run starts on Floor 1, with no shortcut back to a deeper level you cleared yesterday. Second, the way down has shifted: instead of a ladder on every floor, you are looking for holes that drop you between 3 and 15 floors at once. RNG decides how deep each one takes you.

Falling more than three floors at a time will damage your health. Plan your jumps with that in mind.

A normal ladder back to the surface still spawns on every floor when you decide to call it quits.

The main reason to be down there is Iridium Ore. The deeper you go, the better the chances of finding it. You can stack the odds in your favor by checking the Fortune Teller on your farm's TV before heading out and only making serious runs on lucky days.

One wrinkle to watch for: Prehistoric Floors can spawn at random. You will know one when you see Pepper Rexes everywhere (added in version 1.4). Every enemy on a Prehistoric Floor must be cleared before the path down opens.

Die in the cavern and you wake up in Harvey's Clinic with a 1,000g bill for the inconvenience. Doctors are not cheap, even fictional ones.

If you push to Floor 100, you hit a guaranteed treasure room. Read Secret Note #10 beforehand and that floor instead becomes Mr. Qi's hideout, where you can trade items and unlock side quests.

How to Get In

The entrance sits in the northwest corner of the Desert. The door is locked, and only the Skull Key opens it. The Skull Key drops on the 120th floor of the Mines, so you will need to clear that first the old fashioned way using the elevator.

The same key also unlocks the Junimo Kart arcade machine in Gus' Saloon, in case you want a second source of suffering.

Treasure Rooms

After clearing Floor 10, treasure rooms can spawn at random on the floors below. Possible drops include:

• Apple Sapling
• Apricot Sapling
• Artichoke Seeds
• Auto-Grabber
• Auto-Petter
• Autumn's Bounty
• Bean Starter
• Beet Seeds
• Blue Cowboy Hat
• Blueberry Seeds
• Bok Choy Seeds
• Bomb
• Cactus Seeds
• Cauliflower Seeds
• Cherry Bomb
• Cherry Sapling
• Corn Seeds
• Cranberry Sauce
• Cranberry Seeds
• Crystalarium
• Dark Cowboy Hat
• Dish O' The Sea
• Eggplant Seeds
• Energy Tonic
• Fall Seeds
• Farmer's Lunch
• Garlic Seeds
• Iridium Bar
• Iridium Sprinkler
• Kale Seeds
• Life Elixir
• Mega Bomb
• Melon Seeds
• Miner's Treat
• Omni Geode
• Orange Sapling
• Parsnip Seeds
• Peach Sapling
• Pepper Seeds
• Pomegranate Sapling
• Potato Seeds
• Prismatic Shard
• Pumpkin Seeds
• Pumpkin Soup
• Purple Slime Egg
• Quality Sprinkler
• Radish Seeds
• Rain Totem
• Red Cabbage Seeds
• Red Cowboy Hat
• Red Slime Egg
• Rhubarb Seeds
• Roots Platter
• Seed Maker
• Spring Seeds
• Starfruit Seeds
• Stuffing
• Summer Seeds
• Super Meal
• Survival Burger
• Tomato Seeds
• Warp Totem: Farm
• Wheat Seeds
• White Turban
• Winter Seeds
• Yam Seeds

The Auto-Petter, Crystalarium, and Iridium Sprinkler are usually the standout pulls. Prismatic Shards are also worth getting excited about.

Enemies You Will Run Into

Expect any of these to show up depending on the floor type:

• Armored Bug
• Armored Bug (dangerous)
• Big Slime
• Carbon Ghost
• Iridium Bat
• Iridium Crab
• Lava Bat
• Mummy
• Mummy (dangerous)
• Mutant Fly
• Pepper Rex
• Purple Slime
• Purple Slime (dangerous)
• Royal Serpent
• Serpent

Mummies are the trickiest of the bunch because they revive after being killed. The only way to keep them down is to finish them off with Bombs or Cherry Bombs, so always carry a few.

Strategies for Reaching Floor 100

There is no fixed path to Floor 100. The trick is having enough resources and a few habits that stretch each run further. Three approaches stand out.

Use Explosives

Hunting for the next hole with a pickaxe is slow. Bombs, Cherry Bombs, and Mega Bombs clear large chunks of each floor in seconds, exposing holes much faster than chipping at single tiles. They also wipe out clusters of enemies along the way.

Bring Staircases

If you would rather skip the search entirely, Staircases let you descend one floor at a time on demand. Each staircase costs 99 Stone to craft. Stone sells at Robin's Carpenter Shop for 20 to 100 gold per piece, so a single staircase costs between 1,980 and 9,900 gold if you are buying instead of mining. Stack them only once you have a serious surplus of stone.

Pack Real Food

Falling through holes hurts. Combat hurts more. Bring food that restores at least 200 health per use so you do not get knocked out on Floor 87. Maple Bar, Pumpkin Soup, and Crab Cakes all clear that threshold and easily earn their inventory slot.

Save aggressively, run on lucky days, and do not feel bad about leaving a run early once your bag is stuffed with Iridium. The cavern will still be there tomorrow.