Game description from the publisher:
Mask of the Archmaester, the fifth monthly Chapter Pack in the Secrets of Oldtown cycle of expansions for A Game of Thrones: The Card Game, introduces 60 cards - three copies each of 20 never-before-seen locations, attachments, characters, events, and plots to aid your A Game of Thrones deckbuilding goals. This Chapter Pack features more Chain attachments as well as more diverse and surprising events and support for the ever-deepening Maester trait.
New characters from George R.R. Martin's A Song of Ice and Fire are introduced into the Living Card Game environment for the first time, including Ser Jon Fossoway and The Mad Mouse. Exciting new versions of existing characters will also enter the fold, including a Rickon Stark that will aid House Stark's deck-searching capabilities. Watch out as sub-themes expand further, including House Dayne's Starfall Cavalry, Iron Fleet Raiders, and more!