This Ash of War grants an armament the Keen affinity and the following skill:

"Sword Dance: Quickly close in to perform a series of spinning upward slashes. Follow up with an additional input to finish with a downward slash."

Usable on swords, axes, and polearms capable of slashing (colossal weapons and great spears excepted).

The ashes are located on the path northwest of the small golden tree on the west side of Lake Lienia.

The battle ash can be obtained by killing the dung beetles of the small road species.