Monster Cave is a dungeon in Hyperdimension Neptunia Re;Birth1 that can be found in the Planeptune.

Neptune and Compa found the dungeon, while they visited the crash location of Neptune, with bursting in the dungeon. It's later explored more directly after taking the job "The law of a hero" from the Guild. A help screen explaining status effects is shown when first entering the dungeon.


The following Items can be get in the dungeon. Items from the Treasure Chest can be obtain only once. Numbers are marked on the map above.

Note 1:Stars on the map are hidden treasure locations.
Note 2: It gives only one hidden tresure per pass. To become more hidden items you must go in the dungeon again.
Note 3:The number beside the treasure items on the table indicate the point on the map where they can obtained.

Treasure Hidden Treasure Gathering Points
(Item Change OFF)
Gathering Points
(Item Change ON)
1. AGI Booster (Item) [1-2x]
Healing Pod (Item) [1-2x]
Healing Pod (Item) Herb (Material) Herb (Material)
2. SP Charger (Item) [1x]
Hunting Sword (Weapon Neptune) [1x]
SP Charger (Item) Night Moon Grass (Material) Night Moon Grass (Material)
3. Big Online (Idea Chip) [3-4x] Purple Pigment (Material) Mysterious Halo (Material) Fight (Idea Chip)
- Adventure ( Lvl 1 Idea Chip) Messy Cloth (Material) Linear (Idea Chip)
- - Blue Ribbon (Material) Voice Actor (Idea Chip)
- - Checkered Cloth (Material) -
- - Arcade (Idea Chip) -
Shooter (Idea Chip)


Name Drop 1 Drop 2 Drop 3
Ms. Clyde Blue Ribbon ---- ----
Clyde Messy Cloth ---- ----
Pixelvader Pixel Antenna Hibiscon (Neptune) ----
Super Otaku Checkered Shirt Cloth ---- ----
Contracted Angel Mysterious Halo Rabbit Ears (Compa) ----

Scripted type

Name Drop 1 Drop 2 Drop 3
Guard Vermin SP Charger ---- ----
 ???? ---- ---- ----


Neptune and Compa first fall into the cave from the Virtua Forest while investigating where the former fell from the sky. They encountered the Guard Vermin, which was driven off by Neptune's HDD mode.

The next day, the two overhear gossip in town about the cave being a breeding ground for monsters. This prompts them to visit the Guild and to aid Planeptune. Shortly after entering the cave, they bump into another adventurer, IF The cliche meeting is soon interrupted by the return of the Guard Vermin, which Neptune suspects is looking for revenge. The three finish off the monster for good.

Further into the cave, Neptune finds a strange disc hanging on the cavern wall. The disc suddenly glows and several monsters emerge, leading them to realize this is how monsters began appearing in Gamindustri. After breaking a disc, a strange old lady appears stating her surprise to see Neptune here. She becomes indignant when Neptune doesn't recognize her (due to amnesia), and defeats the party in an unwinnable fight.

The woman tries to take Neptune's power, but Compa dives in to save her. IF realizes she's trying to drain Neptune's power as she suddenly began using Compa's speech patterns. Too weakened by the botched copy attempt, the party are now able to defeat her in battle, after which she flees.


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