Event: Jon Snow - Secret Discovery (Political Wins)

Episode 4: The Spoils of War at 23:05
23:05 (+3) Jon Snow:
Jon reveals the ancient petroglyphs carved into the obsidian cave at Dragonstone, showing the Children of the Forest and the First Men fighting together against the White Walkers.

"There is something else I want to show you, Your Grace. The children of the forest made these. ... A very long time ago. They were right here, standing where we're standing. Before there were Targaryens or Starks or Lannisters. ... They were here together, the children and the First Men.
... They fought together against their common enemy. Despite their differences, despite their suspicions. Together. We need to do the same if we're going to survive. Because the enemy is real. It's always been real."
(Secret Discovery)