Cave

The Cave or Underground biome makes up the entirety of the underground layers: sub-levels two through ten. It is comprised of mainly rock, gravel, dirt, water pools, and a variety of ores and gems, becoming more valuable the deeper a player goes. Many biome types exist underground filled with loot specific to those areas. Loot chests are also common and are advised to be raided whenever a player finds one.

Spawn-rates
Sub-Level 2
 * Rate (250)
 * Max spawns (12)

Sub-Levels 3-4
 * Rate (200)
 * Max spawns (14)

Sub-Levels 5-7
 * Rate (150)
 * Max spawns (16)

Sub-Levels 8-10
 * Rate (150)
 * Max spawns (18)

Tips
The deeper you go, the more valuable the ores and gemstones become, as well as the harder the monster varieties get. Upgrade your weapons and armor to the highest tier you can before venturing deeper underground.