[hayate-sama]

Thrones are another Order of Angels, like Kyrios and Virtue. Hence they are another class of CB Gundams. (Note that Thrones are higher up the chain of command than the other Angel classes shown so far, so they are suppose to be more powerful.)

Then

Spoiler for thrones:

i 'm see one of them attack the Exia in the OP and the Kryos too, Are they been stolen or the meister betrayed them ? But Terria betrayed CB, too hard to belief in