We've got dragonglass that Sam used
We've got Valarian swords (even though seems only the baller lords/lordlesses have it...its the sword Jon Snow used to shatter one of em that Ned gave him)
Motherfucking dragons
Samewell has the middle ages wikipedia library of knowledge at his fingertips.

And if you needed a deus ex machina plot device of characters finding out shit they shouldn't know the 'Lord of The Light' religion has been giving niggas visions of the upcoming war fo free!

While I would love to know more about the whitewalkers and their hierarchy that Bran could shed light on (how do baby whitewalkers grow/learn?)...we already got the shitty cliffnote origin story in the Bran story line two years ago, lol.