A Mysterious Chest found in the "Where the Stars Sleep" area on Erd. Note that Erd is in its Earth sign alignment, allowing the chest to be seen.
Mysterious Chests are chests that only appear when a planet is aligned in its colour of the spectrum, or in the case of Nova and Shadra, whether it is day or night. The chest will only appear however, when you enter a new area of a location (i.e., after there is a fade to black transition); chests do not appear spontaneously in an area if you are there at the time when the alignment first occurs.
Erd[]
| Location | Contents |
| Where the Stars Sleep | Putty Pea |
| Wandering Hills | 250 bira |
| Ships' Graveyard | Gaian Brace |
| Ships' Graveyard | 5000 bira |
| Ships' Graveyard | Mole Tail |
| Twisting Hills | Aqua Talisman |
Cassia[]
| Location | Contents |
| Tangerine Beach East | 140 Bira |
| Granule Island | Soul Tank |
| Granule Island | Putty Pea |
| Granule Island | Raincoat |
Puffoon[]
| Location | Contents |
| Quinoa Plain | Putty Pea |
| Quinoa Plain | 750 Bira |
| Couscous Entrance | 3 Yellow Worms |
| Couscous Ruins | 2500 Bira |
Gren[]
None Known
Razen[]
| Location | Contents |
| Jalapeno Wasteland | Putty Pea |
| World Seam | Putty Pea |
| World Seam | Spirit Band |
Nova[]
| Location | Contents |
| Sugarleaf Plains | Putty Pea |
Shadra[]
| Location | Contents |
| Cocoabutter Valley | Putty Pea |