This Halloween will you stand against The Mother of Dragons? Good luck to you. That said… I think this Sons of the Harpy mask from Costume Supercenter is a great idea for a costume.
Anything Game of Thrones related is likely to be recognised and go down well at parties.
We had a White Walker mask in the 2016 12 Masks of Halloween collection. Curious to see what else has gone before then check theMasks of Halloween search results.