Add to Cart Quick view The Secret Art of Game Mastery (Hardcover) DM Lair MSRP: Now: $135.00 Was: Get 250 pages of game master advice, knowledge, and wisdom to elevate your role-playing game! The Secret Art of Game Mastery has over 100 years of accumulated experience, distilled into an... MSRP: Now: $135.00 Was: Add to Cart Quick view Qty in Cart: 0 Quantity: Decrease Quantity: Increase Quantity: Price: MSRP: Now: $135.00 Was: Subtotal: Add to Cart