## you ##

the word "you" refers to the Chaldeans.

## cast figure ##

This is a statue created by pouring liquid metal into something carved in the form that is wanted.  The metal will take the form of the cast and harden as a figure or statue.

## molten ##

This is the word for metal when it is in its liquid form.

## he is a teacher of lies ##

This phrase refers to the carved figure.  By being in the form of a false god, he is teaching a lie.