Answer:There’s actually more than one use.
It can make the wearer melt into shadows, pass through walls and most importantly it can radiate fear on another person.
In Rogue Wave, the second book of the epic Waterfire Saga, Serfina and Neela find reserves of courage and cunning they didn't know they possessed. They face down danger and death, only to endure a game-changing betrayal, as shocking as a rogue wave.
