So, there are two ways to get bloodlines other than spinning them. The easiest, but the more expensive method, is through the RELL Coin Shop. The shop has plenty of great bloodlines, and it refreshes every three hours. That being said, it can get expensive, especially if you spend Robux buying RELL Coins. The other way is through Dungeons. As I am writing this, the new dungeon system has not been released, but with the next update, you will be able to attempt every single dungeon and go for the bloodline you want. This takes a while, but it will be a breeze if you are determined.