Minions

Killing minions will give you bloodline. There are 24 types of minions. There are 2 different types of minions per boss, so 4 minions. There are 8 bosses. 2x8=16. There are good and bad minions. When you get enough bloodline for the first rank-up, you will be asked to chose sides; demon or angel. For some reason you will have to kill your own side to be able to gain bloodline (you will only receive bloodline from the minions, not other people). There are 4 extra types of minions. 4x2=8. 16+8=24.