This box comes with a Special edition book of your choosing. This could be from a bookish box (Fairyloot, Unplugged Box, etc) or a Deluxe edition with sprayed edges.  
It will also come with a cup or mug, 2 bookmarks, straw topper or keychain and book wax melts. These are all chooses at random but will try and match to the books
Mistress of Lies: signed/sprayed edges
Dark and Drowning Tide: signed/sprayed edges
Sing Me to Sleep: signed/sprayed edges
Sun of Blood and Ruin: signed/sprayed edges
The Last Hour Between Worlds: signed/sprayed edges
These Infinite Threads: signed first edition (comes with 2nd book but that is not a special edition) not signed 
Daughter of the Pirate King trilogy: sprayed edges - Deluxe edition- not signed 
Onyx Storm: Deluxe edition with sprayed edges- not signed 
Rise of the Dawnbringer duology: signed/sprayed edges