Williams' refined approach mirrors Arya's own arc, as the lethal little wolf also learns the importance of preparation and rehearsal in her journey through the House of Black and White.
"This was really the perfect season for it," Williams says. "Arya is much more that person as well. Before, everything was about impulse with Arya. For a season for me to really learn about that and channel that - preparation and work - it was a good season to be doing that for Arya as well."
But Arya has an agenda of her own, according to Williams: "Arya this season will learn the most valuable lesson she has learned and will ever have learned. She's going to develop a skill that's going to come in handy and will benefit her for a very, very long time. I guess the people who are training her are going to almost create a bit of a monster. They're going to give away all of their best-kept secrets, and she's going to ultimately use that to her advantage."
'Game of Thrones': Maisie Williams Previews Arya Stark's Dark Season 6 Journey