No depth at all . The ressurection of the qillin was so easy. If a qillin only borns when a leader was chosen is there only 2 qillin on the earth?
They said they are rare not only 2. Credence’s story had no depth at all two. The bonding curse has no depth or any flashbacks, being young isnt a reason for something that big. The characters had no depth. Even the crusio curse was weak as hell.