They're all extremely capable.
The artifact of immense divine power of the Fuyuki War era, the Great Grail, was recently found.
To be more precise, it was declared found.
The Yggdmillennia clan that controls Romania declared they have it.
Yes. One of the masters who fought in the Third Holy Grail War, Darnic Prestone Yggdmillennia.
He's kept the Great Grail hidden for six decades now.
He was researching eternal youth.
Back in those days, the Germans were tracking down arcane artifacts in hope their powers would help them win the war.
Too bold.
They were tricked by the master they thought they were helping.
The Great Grail was stolen while in transit and disappeared.