Answer:
"Boundless and bare."
Explanation:
"Look on my works, ye Mighty, and despair!" The quote is intended to have those viewing the statue to see all of the marvelous things Ozymandias has created, yet they have all decayed and disappeared. The legacy of the "king of kings" is nothing.
I checked the phrasal meanings of all these three words. Closely related meaning to the short truth is just THEME.