Out of the Power 9, 5 of them were the original Moxen (Sapphire, Jet, Pearl, Emerald, Ruby)
Clearly, Prophecy of the Five was foretelling of MoX coming to the server. True story.
I forget exactly, but Prophecy of the Five is out of the KOTOR line of comics written by JJM. However, upon seeing Tensa's description, I'm switching to the above as my default answer