Cave & Ground Crack

On the desert island map, there are cracks in the surface sealed by a rock formation called a "Ground Crack". By blowing up the rock with the item "Explosion Powder," a "Cave Entrance" appears.
 	 	
Ground Crack	Explosion	Cave Entrance
==How to find and blow up a Ground Crack==
There are three cracks in the surface that would be entrances to cave on the island map. The three ground crack are placed on random on the surface and are automatically marked on the map when discovered by the player.
When you discover a crack you should put a Explosion Powder in your inventory and bring it to the crack. If the player then interacts with the rift, the option to blow up the cave will be displayed. If the player chooses to do so, a bomb will be placed, and after the explodes, a entrance to the cave appears.
Explosion Powder can be crafted at a Drawing Desk.
To find cracks efficiently, you can use a Dowsing Pendulum, which can be crafted at a Tinker's Workbench of the crafting furniture. It points the direction of an undiscovered crack from the current location when use it as an item by the player.
==Cave basics==
===Temperature & Environment===
* Time and seasonal changes are the same as on the ground.
* Not affected by weather conditions such as rain and snow on the ground
* Temperatures are seasonally adjusted +- 20 (moderated)
* Always affected by the "Darkness" effect (Mind reduction)
See the General Basics article for environmental differences, including comparisons to the ground.
===Restrictions, etc.===
* You cannot place any objects in cave except for the "Simple Tourch"
* Unable to mount a horse or other vehicle
* Blood Moon Raid does not occur
Note that karma is accumulated if the Blood Moon Raid is avoided by spending time in cave.
===Mobs===
All mobs in the cave do not have nests, so they will not respawn once you defeat them. In addition, the mobs in the cave are active all year round, regardless of the activity period listed in the Mobs article. The mobs that inhabit the caves do not come out of the caves, and the mobs on the ground do not come into the caves as well.
Note that strong mobs such as Mobs:Humanoid and others not found on the ground inhabit caves.
==Materials & treasures found in cave==
Many resources are located in caves, including mines. Randomly generated is
* General wildlifes
* Scool of Fish(fresh water)
* Small amount of wood and mushrooms
* Large amount of minerals
The cave also has at least one or more of the following list
* Crops
* Lovestock or Beneficial Wildlifes
* Fruit Trees
* Chest box(random stuff)
You can acquire these by eliminating the humanoid mobs around them. It is randomly generated and determined which resources will be generated.
=== Fixed resources ===
The following mineral resources and special mobs are fixedly located in the one to third cave counting from the beginning of the game.
First cave 	Copper Rock, Cassiterite Rock, Clay Layer, Sandstone Layer, Limestone Rock Formation, Silver Ore Rock, Sulfur Rock, Quartz Formation, Slime,
Second cave	Copper Rock, Cassiterite Rock, Clay Layer, Sandstone Layer, Limestone Rock Formation, Coal Layer, Silver Ore Rock, Gold Ore Rock, Coal&Amber Layer, Fluorite Rock, Lapis Lazuli Rock Formation,
Third Cave 	Clay Layer, Sandstone Layer, Limestone Rock Formation, Coal Layer, Silver Ore Rock, Quartz Formation, Coal&Amber Layer, Quartz&Cinnabar Formation, Ice Pillar, Slime,
*Rocks and mines spawn in all caves. Resources other than those listed above spawn randomly.
The resources in the cave created by a reoccurrence of crack, described below, are randomly selected from the list above.
==Destruction and sealing of the core==
There is a floating crystalline object called "Cave Source" at deep in cave. The cave becomes inactive when you interact with this object.
You need some time from the time you interact with the cave source until it is destroyed, so you need to wipe out the surrounding mobs before executing the destruction. When the Cave Source is destroyed, an item called a "Piece of Cavern Source" is dropped, which can be used for crafting items described below.
The moment Cave Source is destroyed, all mobs in the cave disappear, and it becomes safe to explore.
If you lose the piece, you can get it again by returning to the same location the next day or later.
=== Crafting ===
Pieces of Cave Sauce are used in the Craft Furniture Witch's Cauldron and can be used as ingredients for two types of item crafting: "Another Dimension Steps" or "Cave Sauce Bomb". An Another Dimension Steps is an item that places another entrance to the cave on the ground, allowing immediate access to that cave.
The Cave Source Bomb, on the other hand, is an item that seals the cave. If this is used at the entrance to a cave, the entrance disappears from the ground. Shortly thereafter, a new crack in the ground (an unexplored cave) will spawn somewhere on the island. The resources in the cave will not regenerate, but by repeatedly sealing and regenerating the cave in this way, mineral resources can be secured.
When a cave is opened, a number is assigned to the cave name, and when the cave source is destroyed, the same number is assigned to the dropped piece. Crafted Another Dimension Steps and Cave Source bomb will also carry that number. Thus, cave and cave source related items are tied together by number and cannot be used in other caves with different numbers.