Multistrike grants your spells, abilities, and auto-attacks the chance to activate up to two extra times at 30% (36% for Holy Priest) of normal effectiveness. For example, if you have 55% Multistrike and cast a Fireball that does 1000–1100 damage, you’ll have two separate 55% chances to automatically follow with another smaller Fireball that does 300–330 damage. That means every time you cast Fireball, you have a chance to see one big-damage Fireball, and then two smaller-damage Fireballs leave your hands in quick succession.