Answer:
They are the group who manages the winged engines of war.
What kind of nail can be grown?
What occurs once in a minute, twice in a moment and never in one thousand years?
What body part is pronounced as one letter but written with three, only two different letters are used?
They are the shore's gallant knights.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.