Fighting to the rhythm of the dance

Exploration Stage: Secret Room
From: Mei
Description: When I was a child, I loved to watch the drums played in the imperial palace. Their movements, though like a dance, actually followed the basic movements of battle. Perhaps the samurai souls lost in the gardens have mastered the art. Find the "echoing flat drum. Let his soul go to sleep.
Completed: This is an old flat drum. I can feel traces of divine power. Perhaps this is from an old temple. This would be able to appease the souls of the samurai.