Cap 414: World tree part 5

The World Tree spirit is saying that if I keep losing control of my Aura it can be dangerous, but what does she mean when she talks about contracts? 

  "Wait a minute, that's a lot of information at once."  (I) 

  "Why are you talking about contracts? What are you trying to say."  (I) 

  "I think it's better to try to be as vocal as possible, it will be better for him to understand."  (Luthien) 

  "I thought I was being direct enough."  (Luth) 

  "Let me try to explain."  (Luthien) 

  "Zenos, you must have realized that you have the power of Chaos, that power is something that is mixed with your very essence, that power is mostly in your Aura."  (Luthien) 

  "I'm not going to try to explain to you about this power, find out for yourself, after all, you've been using it very well without anyone to explain it, maybe you'll find better ways on your own."  (Luthien) 

  "Yes, I agree with what Luthien says."  (Luth)