They wait under the blocks, ready to rise when you dig them free. Released monsters march on your torches, buildings and campfire. Your weapon's tier must match the monster's tier to hurt it.
| Monster | HP | Damage | Speed | Weapon needed | Loot | Where | |
|---|---|---|---|---|---|---|---|
| Slime | 3 | 1/s | 1.1 | Fists or better | 2× Slime Gel | Everywhere; the first monster you meet | |
| Skeleton | 6 | 2/s | 1.5 | Stone Sword | 3× Bone | Far from camp on the surface; common underground | |
| Demon | 12 | 3/s | 1.3 | Iron Sword | 1× Demon Horn, 3× Gold | The far surface at night; the deep underground | |
| Spider | 10 | 2/s | 1.8 | Stone Sword | 6× Fiber | Depth 2 and below | |
| Zombie | 4 | 1/s | 0.9 | Fists or better | 1× Bone, 2× Cloth | Night swarms from the very first night; they never come alone | |
| Slime Monster | 9 | 2/s | 0.8 | Stone Sword | 5× Slime Gel | Mid-surface and the depths; splits into Slimes when slain | |
| Ghost | 4 | 3/s | 1.2 | Stone Sword | 2× Ectoplasm | Born in the unexplored fog at night; drifts through everything; only vulnerable on your lit ground; gone by dawn |
In the dark (night on the surface, always underground), monsters appear on revealed but unlit ground roughly every 5 seconds, up to 6 at once, plus 2 per depth level. Light denies spawns: torches, the campfire and buildings that glow all keep the dark honest.