Appearing at Level 20+ in hidden areas looks like a door with the mob type that will spawn in the vault, right clicking it will show the difficulty of the dungeon as a pop up and above your hotbar.
It has the rare items that normally spawn in Vault Chests making it rewarding and challenging based on difficulty, also it has two important tables at the end of the dungeon Modifier Archive - Alchemy Archive with a dungeon champion guarding it.
Dungeon Difficulty
| Difficulty | Health and Damage | |
|---|---|---|
| Normal | 1.0x Multiplier | |
| Hard | 1.5x Multiplier | |
| Challenging | 2.0x Multiplier | |
| Extreme | 3.0x Multiplier | |
| Impossible | 4.0x Multiplier |
Types of Dungeon Mobs
| Icon | Dungeon Mob | |
|---|---|---|
| (EMPTY) | Skeleton | |
| (EMPTY) | Zombies | |
| (EMPTY) | Piglins | |
| (EMPTY) | Vindicators and Pillagers | |
| (EMPTY) | Spiders |