The amount of Spite needed to unleash a Spiteful Stormbolt has increased, but so has its damage.
Casting and attacking builds stacks of Spite. At 5, a Spiteful Stormbolt arcs towards your current target, dealing [low] nature damage over 3 seconds.
Upon expiration the bolt returns, increasing the amount of Spite needed by 1 and permanently increasing Spiteful Stormbolt's damage against them until either of you die.