This shocking evocation has caused many an uncomfortable sorcerer to squirm in his seat after an unexpected discharge. Ball Lightning is simply a concentrated ball of static energy which swirls around its caster shooting out white arcs at anyone who comes too close. Many sorcerers visualize it as exploding from their rod or staff, where it then orbits the head before splattering into their foes.
Although it is not an especially powerful evocation, having it smack an opponent in the face is enough to put them off balance and a well-aimed shot in the eye can cause a temporary, stinging blindness which affords the sorcerer ample time to ready his more powerful weapon.