Das Rheingold

is an unending mountain of treasure that both provides great wealth and curses its owner with great misfortune.
Siegfried gained the treasure hoard from defeating Fafnir. Siegfried claims the amount was exaggerated, but says it was still enough for some to be left even by the time his great-grandson was an old man.
It is accidentally summoned in the Grand Orders after the summoned Fafnir is resurrected, so he asks Ritsuka Fujimaru to help him find it to keep it from being found by someone else. If the treasure is allowed to flow freely, the humans who find it will become prisoners of the great wealth, eventually causing much destruction as the country is filled with betrayal and distrust.Fate/Grand Order - Siegfried Interlude 2: In Search of Das Rheingold
At some point it came into the possession of the Einzbern family. Because of knowing the gold very well, they can coin vessels of the Holy Grail.Fate/stay night - Fate route - Day 13: infinity arms - You're my only star
==References==
Category:Noble Phantasms
Category:Unclassified Noble Phantasms
Category:Unknown rank Noble Phantasms
Category:Noble Phantasms introduced in Fate/Grand Order
Category:Einzberns
Category:Noble Phantasms of Siegfried