Duncan went on to a storied career with the Welsh National Team, moving
from Beater to Keeper and playing for the World Cup-winning Welsh Squad
of 1910. Duncan served with valor in the Goblin Wars and was instrumental
in the reconstruction of Gringotts Bank following the Armistice of 1918. Duncan
had studied Magical Mining at school, and he oversaw the construction of the
bank's lower labyrinth between 1925 and 1931. Suspicion swirled around Duncan
after the Great Gringotts Job in '33, and it was widely rumored that Duncan had
forged a key that could open any chamber in the bank. Though the subsequent
investigation proved charges against Duncan's old teammates Desmond and
Alexander Last, Duncan's involvement was never proved; and the so-called
'Key of Duncan', if it exists at all, was never found.