I think this song is about a nuclear bomb, like Hiroshima or Nagasaki, because it talkes about vapourisation, 'And dust replaced their souls', people are turned to dust, literally, when they are caught in a nuclear bomb blast, and 'A raging ream of light', which would be created by such an explosion.
'Rest in peace is all over now' could refer to the end of World War 2, which was immediately after the attacks on Japan, and the bomb did wipe out whole generations, hense the Last Generation.
I think this song is about a nuclear bomb, like Hiroshima or Nagasaki, because it talkes about vapourisation, 'And dust replaced their souls', people are turned to dust, literally, when they are caught in a nuclear bomb blast, and 'A raging ream of light', which would be created by such an explosion. 'Rest in peace is all over now' could refer to the end of World War 2, which was immediately after the attacks on Japan, and the bomb did wipe out whole generations, hense the Last Generation.