The phrase most commonly refers to a specific Dungeons & Dragons (D&D) supplement released in the early 1990s. The Thief's Player Pack (TSR 1115)
If you are not referring to D&D, "pack 1115" could relate to: pack 1115.rar
This "pack" refers to the supplement titled The Thief's Player Pack , published by TSR in 1994 with the product code TSR 1115 . The phrase most commonly refers to a specific