The "Ash of War" imparts the Keen affinity to a weapon and introduces the skill "Bloodhound's Step."

Bloodhound's Step: This ability enables temporary invisibility during high-speed dodges. It allows swifter and more extensive movement than a standard quickstep, facilitating circling around locked-on targets.

This "Ash of War" is compatible with all close-quarters weapons.

Acquire these "Ashes of War" on the bridge north of the Wizard's Tower in Garydraine.

Visit the site during the night, confront a Night Cavalryman, and secure the battle ashes by overcoming him in combat.