Zahariel is a very important character, he mentioned through out the book.
When the book starts when he is only a young recuit in The Order. Zahariel did not come from a wealthy family like most other knights did.
Zahariel achieves many thing throughout the book some of them are when he has to stand out in the freezing cold snowing weather at night as a test to see if he has both good pyshical and mental health with he passed with his cousin Nemiel.
Zahariel and Nemiel are always involed together in the story for instance, when brother Amadis takes all the suplicant knights of on a hunt Zahariel and Nemiel are in the same team with about 8 other suplicants are attacked by a large owl like beast only big enough to eat a small human whole. Zahariel distracts the beast while his team take cover but he couldn't save 1 of his team members who gets shreded to bits. Lucky or Zahariel when the beast swoops at him brother Amadis shoots the beast in the heads.
Another major thing that happens to Zahariel is when he and Nemiel find Lord Sartana of the Knights of Lupus and watch him kill himself.
So as you can see Zahariel has a very interesting time in the Order because of all those things and more.