With the addition of several brand-new cards and a ready-to-play Deck that makes these Monsters more powerful than ever, ancient Monarchs are back to rule with the Emperor of Darkness Structure Deck. The set is filled with some of the most imposing Monsters ever made, and they demand Tribute! Monarchs are high-Level monsters that unleash their devastating elemental powers when Tributes are offered to Summon them. Strike a combo using the mighty Erebus the Underworld Monarch with new support cards like Eidos the Underworld Squire or The Prime Monarch, to thwart your opponent's strategy and reinforce your Deck! There are 8 decks per box. Each Emperor of Darkness Structure Deck contains 36 Common Cards, 2 Ultra Rare Cards, 3 Super Rare Cards, 1 Token Card, 1 Beginner's Guide, and 1 Double-sided Deluxe Game Mat/Dueling Guide.