The Amber Island's Cave, also referred to as the "Haunted Cave of Portia", is a cave located in the middle of Amber Island. The cave is initially inaccessible until the player builds the bridge to Amber Island and is given permission by Mayor Gale to enter the cave. Deep inside the cave houses numerous monsters and the exclusive Hermit Snaillob, a giant Snaillob. A dysfunctional power generator can be found inside and requires a Removable Battery to restore the power. With a functional power generator, the closed-off area becomes accessible that allows deeper exploration of the cave. The Bandirat Prince marks its territory here, whom is hiding all of the stolen items from the citizens of Portia.
Sometime prior to building the bridge, the Bandirat Prince made the Amber Island's Cave its home and kept all stolen goods inside. After building the bridge, Mayor Gale instructed the player to investigate the haunted cave and restore the power generator with the Removable Battery, unbeknownst to him of the dangers lurking inside. Gale had planned to make the cave an attraction, calling it the "Haunted Cave of Portia", and instructed Liuwa to guard the entrance to the cave from the citizens until it has been inspected.
The player navigated the cave and restored the generator's power. As a result, the closed gate revealed itself, while also closing off the opposite entrance. The player forcefully explored the rest of the cave, recovering all of the stolen items along the way. At the end of the cave, the player finds the Bandirat Prince lying on Presley's sofa. The Bandirat Prince ordered its minions to attack the player but did not stand a chance. The Bandirat Prince retaliated until it too was defeated by the player. After its defeat, the Bandirat Prince dropped its priceless possession, the Small Engine.
After exiting the cave, the player found themselves back in Portia near Dr. Xu's Clinic. The Civil Corps bumped into the player just as they were about to enter the cave to explore the area. The player recalled their investigation to the Civil Corps, providing details of all the events that had happened while inside the cave. Thankful for subduing the monsters inside the cave, the Civil Corps instructed the player to report back to Gale. The Civil Corps entered the cave to clear off any stragglers left inside the cave.
After the events of the Amber Island's Cave, the former entrance on Amber Island became inaccessible. The alternate entrance can still be accessed, albeit only the room that held the Bandirat Prince can be explored.
|Emily's Bucket||A weathered bucket used for many things on Sophie's Ranch, property of Emily.||10|
|Gust's Lamp||A blue lamp belong to Gust, very expensive looking.||20|
|Martha's Pot||Martha's cooking pot. You can still see some oil stains on it.||10|
|McDonald's Ceramic Jug||A jug used by McDonald to store milk.||10|
|Presley's Sofa||A meticulously made couch, very comfortable, belongs to Presley.||40|
|Remington's Shoes||Remington's old shoes, it's worn.||10|
|At the top of the rails, in the generator room||Beginner's CapTopaz|
|In the room in the middle of the right path||Old Parts|
|In the room in the middle of the left path||Power Stone|
|After defeating Prince Bandirat||Small EngineData Disc|