| Honorable Goblin |
Just the +1 increases.
Example, the Aberant Bloodline's Acidic Ray bloodline power does "1d6 points of acid damage + 1 for every two sorcerer levels you possess." This means that at 1st level, the ray deals 1d6 acid damage, and 2nd and 3rd it deals 1d6+1, and 4th and 5th it's 1d6+2, etc.