Class Features are generally passive benefits that characters gain based on their Class but can also some times be active Skills that you can use in combat. Storm Call is a one of many Class Features in Pathfinder: Wrath of the Righteous.
If in a stormy area (including a whirlwind formed by an air elemental of at least Large size), each bolt deals 3d10 points of electricity damage instead of 3d6. The lightning storm lasts for as long as she continues her performance, calling down one bolt of lightning per round on a random enemy within 50 feet of the thundercaller.
At 8th level, the thundercaller can use her performance to summon bolts of lightning that deal 3d6 points of electricity damage.
