Soul Storm is a powerful Voodoo attack used by Jolly Roger himself during Invasions.
It is said the hex can do anywhere from 450 to over 1900 damage depending on the number of players . This makes the attack dangrous for most pirates under about level 40. It hits all enemies within a certain distance of Jolly Roger. A good way to avoid it is if you see him raise up his arms, RUN! This is usually a sign he is about to use this deadly voodoo power.