Mummy – also billed as A World of Darkness: Mummy, using the same branding as the original A World of Darkness supplement – was a 1992 release for Vampire: the Masquerade and was one of the last books for the Storyteller system released when Vampire had the stage all to itself. Indeed, as well as hyping the forthcoming release of Werewolf: the Apocalypse, Mummy makes a mild pretence of being a crossover supplement, claiming that you can use it just as well in a Werewolf game as in Vampire.
However, whilst you doubtless could use the rules explanation from Werewolf to run this, the fact remains that this was released with the distinctive green marbled trade dress that’s associated with Vampire, and precisely because Werewolf was still in development when this was being written it leans on Vampire much more than it does Werewolf; there’s a very, very few token references to the Garou, and the spirit world that the titular mummies enter between bouts of life is clearly based on a rough outline of Werewolf‘s Umbra, but the whole mummy thing calls on Vampire much more than it does Werewolf. (Indeed, the backstory of the mummies is intimately entwined with that of the Followers of Set, having been sparked off by a Kindred intervention in proto-Egyptian politics.)
Refereeing and Reflection 