This Ash of War grants no affinity to an armament, but imparts the following skill:

"Barrage: Archery skill using a bow held horizontally. Ready the bow, then fire off a rapid succession of shots faster than the eye can see."

Usable on light bows.

The battle ashes are located next to the blessing of the Gemir Volcano 【Boiling River】.

You can get the battle ashes by killing the dung beetle a little north of Blessing.