I heard that in a passage in the Talmud it says Persia will completely annihilate Edom and the rest of the world which will then spur about moshiach' arrival, the Yalkut Shimoni (Yeshaya 60:499), records the following amazing but scary prophecy regarding the events that will unfold just prior to the Messianic Era: “Rabbi Yitzchak said: The year in which the King Messiah reveals himself [to all of mankind], all the nations of the world will be fighting with each other. The King of Paras [Persia] will fight with the King of Arabia, and the King of Arabia will go to Aram [Syria] to seek counsel from them. The King of Paras will [attempt to] destroy the entire world, and all the nations of the world will be screaming and confused and falling on their faces, and they will experience pains like those of a woman giving birth. The Jewish people will also be screaming and confused, and will say, ‘To where shall we come and go? To where shall we come and go?’. And G-d will say to them, ‘My children - don’t be afraid - for all that I have done, I only did for your sake. Why are you afraid – the time for your redemption has come!, my question is what weapon of choice will Persia use to bring about this result.