Dungeon

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

Dungeon Crates

Icon (empty)	Name	Description (empty)	Loot
(EMPTY)	Living Crate	(EMPTY)	Inscription Mystery Egg Inscription Piece Vault God Charm
(EMPTY)	Ornate Crate	(EMPTY)	Helmet Chestplate Leggings Boots Sword Axe Shield Focus Wand Waning Focus Waxing Focus Fundamental Focus Opportunistic Focus
(EMPTY)	Gilded Crate	(EMPTY)	Jewel Pouch Key Piece Magnet Trinket