Can be usefull on its own, on fights like lei she where you are having moments with only tank dmg, but it is very strong together with spirit shell aswell. If you are doing Thok you can get 2-3 pohs off during the screeches without getting interrupted. Useally use it in conjunction with devotion aura myself on that fight which equals a full duration of spirit shell. It got many nice uses, dont just macro it in.