Sphere of Antallos
From Tardis Wiki, the free Doctor Who reference
The Sphere of Antallos was, according to the Eleventh Doctor, the "only surviving record of the echo-universe", and was lost forever in the Final Shadow Cascade. When he found it in the Ziggurat of Cornucopia, he became overcome with greed from the large emotional field present and attacked Rory. (COMIC: The Cornucopia Caper)
