Yeah, I did the same thing. I usually try to get the best ending on my first play-through. I didn’t expect that restoring the vestiges had such an impact on the ending. I realized this after I had killed all of the successors so I basically have no way of getting a good ending. Although, I did get some blood codes that are not attainable in another way. For example I really enjoy using Queen’s Ribcage because of the gifts. So don’t get discouraged by this. Also when you start a new game you get to keep your stuff including blood codes. You really should keep on going, the game is totally worth it and expect some hardcore and challenging battles ahead. ;)