Anthony, Demiurge wrote: Let's take the Heroic Pack. You have a ~71% chance to get a 2-Star, a ~23% chance to get a 3-Star and a ~6% chance to get a 4-Star. When you open a pack, you have an overall 5% chance to get a Bonus Hero. The way we get to that math is to set the chance to get a Bonus Hero per rarity that you draw. When you draw a 3-Star or 4-Star, you have roughly a 17% chance to get a Bonus Hero. When you multiply the chance to get a cover of that rarity with the chance to get a Bonus Hero, you get the [percent] chance to get a Bonus Hero from any one pull from a Heroic pack (~4% for 3-Stars and ~1% for 4-Stars).