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 Structure Deck: Wave of Light. 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.