Sadu-Hem was to act as the conduit between Rasputin and the Ogdru Jahad, but was destroyed after Abe Sapien speared Rasputin to death and Liz Sherman set the entire place on fire.
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The priest had spent time in Tenochtitlan before it burned, and had learned the history of the Ogdru Hem there.
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Just as the President was about to resort to a nuclear strike, the BPRD's Liz Sherman managed to burn Katha-Hem to ashes, using an ancient artifact that mysteriously amplified her powers a thousand times.