Chain of Fate

The Chain of Fate is what binds souls to their living body. When the chain of fate is broken an erosion will take place from the end of it after being broken. Once this happens a gradual process of hollow transformation takes place and when the person transforming into a hollow gets hungry he is a step closer to becoming a hollow. The last erosion is nothing like the others and its pain is great. Ichigo was able to fight the hollow transformation but he gained hollow powers.