Final Showdown

"Your enemy is a creature of darkness, whose powers are beyond mortality. When the hour of judgment arrives, this card will lead you to him!"
  Her hand trembles above the card for a silent moment—and then deft, ancient fingers reveal its opposite side.
  In the darkness, the fifth and final illustration is only barely visible through the smoke and unnatural murk. Upon the card's surface dwells a depiction of a crowned, grinning emperor clad in royal finery and reaching for a goblet of wine—though his limbs are wooden puppet’s limbs, lashed to corded strings that disappear into the darkness overhead.
  Madam Eva slowly exhales. "The Marionette. Look to great heights. Find the beating heart of the castle. He waits nearby."