What is covered in Flame Barrel (Flame Vent) for Sekiro: Shadows Die Twice?

The Flame Vent is a potent Shinobi Prosthetic Tool that allows Sekiro to unleash a torrent of fire.

How do you complete Flame Barrel (Flame Vent) in Sekiro: Shadows Die Twice?

The Flame Vent is a potent Shinobi Prosthetic Tool that allows Sekiro to unleash a torrent of fire.