The greatest sorcerer of the Thousand Sons has finally found the relic he's been searching for - the Key of Infinity. But is it too late for him to use it? Ahriman languishes on the threshold of space and time, adrift in a sub-realm of unknowable dimension and aspect. He has found it at long last: the ancient device known to the necrons as the Key of Infinity. This should be his moment of triumph - but he is not the Ahriman he used to...