When determining the effects of your bloodline powers, you're considered 4 levels higher. This increases the effects of powers you have access to, but doesn't grant you powers at a lower level than normal. If you have a sorcerer bloodline power that can be used multiple times per day, such as metamagic adept, you gain a number of extra uses of that power equal to half your tier (minimum 1). You must have the bloodline class feature to select this ability.