The Castle Annex (Japanese: 大魔王のかくし部屋 Dai-maou no Kakushi-beya; Dark Lord's Hidden Room) is a random dungeon located inside Dark Lord's Castle in Karkaton. Only certain quests allow the player access to this area. The monsters in this dungeon are significantly tougher compared to the ones in the main areas of the castle.
Monsters
Level 26-28 quests
- Gold Butterfly
- "Noble Lady"
- Facerberus
- Rock Hopper
- Arachno"Traveler" (possible boss)
- "Traveler" Cobra (possible boss)
Level 30-39 quests
- Puppetmaster
- Moldy Mummy
- Red Dragon
- Licorice Jelly
- Dark Medusa
- Angry Queen
- Black Butterfly
- Red Orochi (Youngest Fab Fairy's quest boss; Level 38)
- "Traveler" Slime (possible boss)
- "Traveler" Mouse (possible boss)
- Imp "Traveler" (possible boss)
- "Traveler" (possible boss)
- Iron General (possible boss)
- Butterfly "Traveler's Friend" (possible boss)
Level 40-49 quests
- Fossil
- Heavy Hammer
- Punk Pengy
- Red Orochi
- Ham Sandwich
- Licorice Jelly
- Red Dragon
- Moldy Mummy
- Puppetmaster
- Purple Woof-o'-the-Wisp
- Puppet "Traveler" (possible boss)
- Extra Spicy Burger (possible boss)
- Lizard"traveler"man (possible boss)
- "Traveler's Friend" Tomato (possible boss)
- "Traveler" (possible boss)
- "Traveler's Friend" Shield (possible boss)
- "Traveler's Friend" Cobra (possible boss)
Level 50 quests
- Devilish Skulleton
- Black Snurp
- Heavy Hammer
- Great Harpy
- Replica Dark Lord (enemy, Youngest Fab Fairy's quest boss; Level 50)
- "Traveler"berus (possible boss)
- "Traveler" & Orochi (possible boss)
Areas around Castle Annex
- Grand Hall (north, east)
- Karkaton Peak (south)
Trivia
- This is one of the random dungeons that have their own unique name.