re: What do you think Arya's new weapon is foreshadowing?

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I remember there was a theory about Meera having Dark Sister (from the 3ER) because it looked like she was holding something that looked like a wrapped up sword after they fled.

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I was hoping we'd see Meera (and maybe even Howland) again, but the remaining time is so short, I guess not).

Withe regard to main characters using WW/Wight killing weapons, I think the slate for this battle is set:

Jon using Longclaw
Jorah using Heatsbane
Brianne using Oathkeeper
Jamie using Widow's Wail
Arya using the dagger
The Hound using the big dragonglass axe.

Jon & Danny will use the dragons

The Unsullied, Dothraki, northern soilders, wildlings and Vale army will all likely be equipped with dragonglass weapons and/or dragonglass enhancements to their weapons.

Fire/flaming projectiles will be used.