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, unarmed and without magic or supplies. The main aim of the rite is to survive. Many Illyrians who enter the rite often kill each other. 
Devlon permitted Rhysand, Azriel and Cassian the permission to perform the rite. 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)