Ment
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I doubt they are immortal, especially considering the words from Sar-Elam's manuscript on necromancy found by Belket: "For Asha is the goddess who created the world and gave it her name, she is all the facets of the wheel of existence; a threefold entity of birth, life, and death...."
But if they are indeed immortal, then such characters as Michael and the remaining Faceless Ones should still be alive, right?