A most rare treasure said to be found only on the legendary planet Mariglenn. Dorgengoa asks the Queen of this planet if he could have it, only to be told that such a treasure is doubtfully existent, for the lady herself has no possession of it nor knowledge of where it could be found.
- Since the planet is also called "Eden", the Eternal Soul might not be a treasure that can be valued with money price. It can very well be the invaluable jewel of eternal life given to one who has passed away. Taking this into consideration, and the fact that Mariglenn is considered an elusive "phantom planet", where normal people can't enter, one could conclude that this treasure was one that only the inhabitants of Mariglenn possessed, having surpassed death virtuously.