Structure Deck: Lair of Darkness is a Structure Deck in the Yu-Gi-Oh! Trading Card Game (TCG). It is the 41st Deck in the TCG's Structure Deck series, following the Wave of Light Structure Deck. This deck is the TCG equivalent of Structure Deck R: Curse of the Dark in the OCG.
Each Structure Deck: Lair of Darkness contains:
- 1 Preconstructed Deck of 41 cards
- 1 Common Token
- 1 Beginner's Guide
- 1 Double-sided Playmat/Dueling Guide
- The "Power Up with Packs" supplement on the back of the included play mat suggests combining this Deck with the following cards from these sets.