Event: Qyburn - Secret Discovery (Political Wins)

Episode 10: The Winds of Winter at 17:14
17:14 (+3) Qyburn:
Qyburn's "More. Much more." report to Cersei in S6E8 is revealed to be his discovery of the barrels of wildfire buried beneath King's Landing, as Lancel Lannister discovers a cache set to trigger an explosion during the Trial by Seven at the Sept of Baelor. (Secret Discovery)