"Yes, my [lord/lady]. About a league south, according to the report." Maester Lucas and you both glance at the map, mentally measuring the distance to here.
"It's nothing I've heard of," he says. "They call it 'the Greenseer's Glass'. I don't know if it's a weapon or a mirror or a substance to be forged."
Maester Lucas finishes his report. "Our surviving sworn sword says the wildlings told of an ancient magic that turns back wights and Walkers alike."
"Tell me more about this ancient magic."
"Our sworn sword heard wildling fables. Do we have any reason to think it's more?"
"The wights that attacked them were south of the Wall?"
Maester Lucas shrugs. "Wildlings have lived through more than a thousand winters since the Long Night. Perhaps they know something about surviving."
"If such a weapon exists, Westeros will need it to face what's to come."
"They survive cold and ice bears. They're as terrified of White Walkers as we are."
"Winter is coming...We may not have as much time to prepare as we'd hoped."