Defect

A defect is a specific limitation on a ziraduun 's ability to use wizrada. Defects vary widely from person to person, and not all ziraduun have a defect.

Having a defect is different from lacking facets or aspects of wizrada. A shadowcaster might have a certain facet and be able to cast all the spells typically within the scope of that facet, but might only be able to do so using a very specific ritual (whereas other shadowcasters do not need the ritual). The caster's need for the ritual, therefore, would be called a defect.

Though studied intensely during the Myriad, the cause of defects is unknown.
 * Entering the Shadow / Dream: By far the most common defect among both shadowcasters and grim dreamers is an inability to sense or use wizrada without first silencing all physical sensations in the flesh (for example, by deep meditation in a dark, quiet place). Deprived of physical sensation, the mind perceives the shadow (or dream) as a replacement physical reality.  This practice was so common, it was called "entering the shadow" or "entering the dream" and was taught to many ziraduun -- even those without defects.
 * Nimfaeti's Blood Defect: Nimfaeti is unable to sense the grim dream normally. She can only reach the dream by using her own blood as a medium.  She must draw her own blood to cast spells, and her powers are limited.  This is a severe defect.