Skull Cavern - Stardew Valley Wiki Guide - IGN (2023)

The Skull Cavern is a cavern found in the Calico Desert. You will not be able to access it until you obtain the Skull Key. It is an endless dungeon which can be used to gain XP by fighting monsters, or to hunt for treasure. There are some special challenges in the Skull Cavern too.

Navigating the Skull Cavern


Exploring the Skull Cavern works a lot like the Mines, in that the goal is to go lower each time. However, there are a few substantial differences, the main one being that the Skull Cavern is completely bottomless, although there are rewards for reaching levels 25 and 100, explained below.

Time also moves slower in the Skull Cavern. In the base game, 1 game hour translates to 42 seconds. In the Cavern, it's 54 seconds, which means you get 'longer' to explore while less time passes. However, any timed debuffs are less effective in here.

In the same fashion as the Mines, you find ladders by smashing rocks or by killing enemies, and use these to descend. However, you can also find shafts. These holes in the ground can be jumped in, and will let you travel down between 3-15 floors at once. You will take fall damage, at a rate of x3 the number of floors skipped (meaning losing 45HP for 15 floors is the maximum), though you will not drop below 1HP.

If you do drop to zero HP in the Skull Cavern, you will wake up at Harvey's Clinic, and will have to pay 1,000g. if you remain in the Cavern past 2am, you will pass out and again wake up at the Clinic, and will either need to pay 1,000g, or 10% of your wealth; whichever is less.

There is no elevator to save your progress, but you can leave immediately from any floor by using the ladder at the back. Each visit starts again from the first floor. You can also craft staircases to immediately skip a floor.

The lower you go, the more chance you will get Iridium Ore, and the more chance the monsters will drop Iridium Bars.


There are variety of monsters in the Skull Cavern. The table below gives a full breakdown of each one.

Armored Bug0*8*Cannot be killed without bug killer enchantment.
Big Slime605A chance to split into smaller Slimes when killed. Big Slimes are usually purple in the Skull Cavern.
Purple Slime41028Can drop Iridium Ore, Iridium Bars.
Lava Bat8015Appears rarely; flies.
Mummy26030Needs to be finished with a bomb of any type after being knocked out with other weapons. If a bomb does enough damage to knock the Mummy out, it will also destroy it.
Serpent15023Moves quickly; default flying enemy.
Iridium Bat30030Appears at level 50+. Very high HP and Damage.
Iridium Crab24015Appears at level 26+.
Carbon Ghost19025May appear on Mummy levels. Frequently drop Omni Geodes.
Pepper Rex30015Appears mainly on Prehistoric Floors; breathes fire.

Treasure Rooms

After level 10, floors may be small rooms containing a chest and no enemies. Having the Special Charm and having high Luck from the television fortune teller increase your chances of finding Treasure Rooms.

NameNumber In ChestChance
Mega Bomb51/25
Cactus Seeds151/25
Life Elixir2-41/25
Omni Geode51/25
Warp Totem: Farm51/25
Rain Totem1-31/25
Apple Sapling11/150
Apricot Sapling11/150
Cherry Sapling11/150
Orange Sapling11/150
Peach Sapling11/150
Pomegranate Sapling11/150
Iridium Sprinkler1-21/25
Quality Sprinkler41/25
Parsnip Seeds5-201/675
Bean Starter5-201/675
Cauliflower Seeds5-201/675
Potato Seeds5-201/675
Garlic Seeds5-201/675
Kale Seeds5-201/675
Rhubarb Seeds5-201/675
Melon Seeds5-201/675
Tomato Seeds5-201/675
Blueberry Seeds5-201/675
Pepper Seeds5-201/675
Wheat Seeds5-201/675
Radish Seeds5-201/675
Red Cabbage Seeds5-201/675
Starfruit Seeds5-201/675
Corn Seeds5-201/675
Eggplant Seeds5-201/675
Artichoke Seeds5-201/675
Pumpkin Seeds5-201/675
Bok Choy Seeds5-201/675
Yam Seeds5-201/675
Cranberry Seeds5-201/675
Beet Seeds5-201/675
Spring Seeds5-201/675
Summer Seeds5-201/675
Fall Seeds5-201/675
Winter Seeds5-201/675
Cherry Bomb151/25
Red Slime Egg11/25
Purple Slime Egg11/25
Energy Tonic2-41/25
Iridium Bar2-31/25
Autumn's Bounty51/250
Pumpkin Soup51/250
Super Meal51/250
Cranberry Sauce51/250
Farmer's Lunch51/250
Survival Burger51/250
Dish o' The Sea51/250
Miner's Treat51/250
Roots Platter51/250
Prismatic Shard11/250
Seed Maker11/25
Blue Cowboy Hat11/25
Red Cowboy Hat11/25
White Turban11/25

Prehistoric Floors

Prehistoric floors are an infested floor containing mainly Pepper Rex monsters, but Mutant flies and Iridium Bats may also appear. Here, Dinosaur Eggs and Fiddlehead Ferns can be foraged.

Reaching Level 25


The day after you first enter the Skull Cavern, you will receive a letter from Mr Qi. It challenges you to reach level 25, with a 10,000g reward. If you reach level 25 on your first trip, you will get the reward along with the letter.

Reaching Level 100

If you have read Secret Note #10, once you reach Level 100 of the Skull Cavern, Mr Qi will be waiting for you. If you arrive having used 10 or fewer staircases, he will congratulate you, while if you have used more than 10, he will call you "clever" but "not honorable". Either way, he will give you Iridium Snake Milk, which grants a permanent 25HP boost.

Up Next: Farm


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