The Tiniest Cave

The Tiniest Cave is a hidden side quest in Dragon Age: Inquisition

"Someone or something has stirred inside the tiniest mouth of the tiniest cave in the Emerald Graves. Now it demands crystal grace."

Acquisition
There is a small rock formation east of Direstone Camp. The quest is obtained by jumping on top of it about 50 times, until a voice activates the objective.

Walkthrough
Place 10 Crystal Grace at the cave. The voice will will point you towards "the steps" - specifically, a staircase under Suledin Keep reached by walking through a rock. There will be a chest with a random amount of gold (~250) and the unique helmet Ardent Blossom.