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

"Shield Bash: Brace behind shield before using bodyweight to ram foes while maintaining guarding stance. Weaker enemies will be shoved backwards, and can even be staggered."

Usable on all shields.

The ashes are located next to the bridge at the east gate of Lake Lienia.

You can get the battle ashes by killing the dung beetle under the second bridge hole in the northeast direction of Blessing.