Variants, optional rules, alternate settings, and miscellaneous hacks are what you get with Mirrors. A supplement for White Wolf’s World of Darkness game, this e-book contains optional systems for morality, insanity, conviction, virtue (or vice), mental combat, social combat, even miniatures combat. Also:

The World of Darkness Revealed, wherein the monsters stand exposed for all humanity to see; The World of Darkness Destroyed, which gives you the option of playing out the global apocalypse; and The World of Dark Fantasy, a fantastical spin on the system and setting.