The Blood Rite is an Illyrian ceremony that is completed when a novice warrior wants to progress to the status of a true warrior. Each Illyrian enters the mountains, wings bound, without magic or Siphons. The only supplies they have is what they have on them. The main aim of the rite is to survive. Many Illyrians who enter the rite often kill each other. 
Devlon allowed Rhysand, Azriel and Cassian to perform the rite despite their status'. Each of them started the rite at a different location in the mountains, however, all three managed to find each other and survive together.
- A Court of Mist and Fury (Mentioned only)