It's a free target cast, you click the ground after you click the powder. Also could be location based, do it in the zone in area, I think the area has forges in it. https://www.raidloot.com/spells?name=black powder blast&effect=&class=&level=&view=
Thank you for the reply, 100% i was not using it correctly. Clicking on the ground was my issue and crazy but I got the ring on the first captain. Thank you much!
