Once you have acquired a
dragon forge core, 3 dragon
forge vents, a dragon forge
input, 8 dragon bone blocks,
and 14 dreadstone bricks,
you can construct the
dragon forge itself.

In order to power the forge,
dragon's breath is required.

This can be achieved by placing
a tame dragon directly in front
of the input. The dragon will
begin to breathe into the input
as long as there are valid items
in the forge.