Way of the Flame is a Mythic Technique that sets Jin's katana on fire using Incendiary Oil. You learn it in The Undying Flame, and it makes your swings unblockable and burning for a short time.
Light up before charging a group. Burning enemies panic while taking fire damage, and they can't block your swings.
The Charm of Steadfast Fire stretches the burn to about 20 seconds. The Charm of Blazing Flame adds damage and lets heavy attacks burn nearby enemies.