In the Prince's final speech which make up the last words of the play, he says:
A glooming peace this morning with it brings;
The sun, for sorrow, will not show his head
Go hence, to have more talk of these sad things;
Some shall be pardon'd, and some punished:
For never was a story of more woe
Than this of Juliet and her Romeo.
What poetic device does he use to communicate the somberness of the events?