Dungeon of Ruin Level 1

Minimum level: Unknown
Mob/boss levels: Ghost Zombie (level 121 monster), Dark Elf Archer (level 122 monster), Summoned Graveyard (level 123 Boss)
Travel gear required: Heart of Darkness
Resources available: Mining, foraging
Drains? Energy drain (level 122 monster), Mana drain (boss)
Vamps? No
Combat-spirit ratio: Unknown
Important drops: None

Dungeon of Ruin Level 2

Minimum level: Unknown
Mob/boss levels: Greenglow Larva (level 123 monster), Headless Maiden (level 124 monster), Greenglow Fly (level 125 Boss)
Travel gear required: Heart of Darkness
Resources available: Mining, foraging
Drains? 123 mob drains mana
Vamps? Boss vamps HP
Combat-spirit ratio: 50/50, 123 100% spirits, 124 100% combats
Important drops: None

Dungeon of Ruin Level 3

Minimum level: Unknown
Mob/boss levels: Sticky Tendril (level 125 monster), Scythe Pinch (level 126 monster), Animated Mist (level 127 Boss)
Travel gear required: Heart of Darkness
Resources available: Mining, foraging
Drains? Monsters and boss drain energy
Vamps? No
Combat-spirit ratio: 50/50
Important drops: None