According to the monks stories, what common trait do nebuchadnezzar and belshazzar share?

According to the monks stories, the common trait that Nebuchadnezzar and Belshazzar share is worshiping false idols.

Nebuchadnezzar constructed a large gold statue that he demanded his subjects pray to or else be cast into a pit of flames.

His son Belshazzar was also doomed for worshiping false idols, beside God himself.