You are able to use your shadow conjuring powers more and they are more effective while located in the shadows.

Prerequisite(s): 6th-level Shadowdancer

Benefit: You are able to use your shadow call class ability a number of times per day equal to your shadowdancer level instead of the normal amount. In addition, whenever you use a shadow conjuration or Greater shadow conjuration spell and its effects are located at least partially in an area of dim light, its effects are considered 5% more real and 5% more likely to work per level of shadowdancer you possess.

Normal: Normally you can use your shadow illusion ability once per day at 4th level and one additional time per day per 2 additional levels of shadowdancer you possess, and the effects of the spell are 20% real (for shadow conjuration) or 60% real (for Greater shadow conjuration).