Eldar are known to pursue any task they set out to do with an intensity that makes human efforts pale in comparison. When an Eldar feels called to the path of the Warrior, he or she will join an Aspect Shrine, a cult of warriors who train themselves to embody some aspect of the Eldar War God Khaine or ancient Eldar myths and legends. All Craftworlds have some Aspect Shrines, although some, notably Biel-tan, have more than others and place a greater emphasis on the Path of the Warrior.
Each Aspect Shrine is led by an Exarch, an Eldar fallen to the curse of inability to leave the Path of the Warrior. These Exarchs are powerful warriors, doomed to either die on the battlefield, or to eventually be chosen to become the Avatar of Khaine. The first or founder of an Aspect Shrine is called Phoenix Lord. When an Aspect warrior becomes an Exarch, they will don one of the ancient suits of Exarch armour that belong to that shrine, and this suit will bond to their flesh permanently. This means that the new warrior's soul merges with those of the previous wearers of the suit, essentially a compact version of the Infinity Circuit.
Once an Eldar warrior finishes his time as an Aspect Warrior, they move on to other occupations, as per the convention of the Eldar Path. Since the population of the Eldar race is low, all Eldar are expected to serve if called to fight. Thus, if the Craftworld subsequently goes to war, these former Aspects will frequently be called upon to serve as Guardians, a type of citizen-soldier serving to defend the Craftworld.