uncommon darkness evocation 

Cast [>>] somatic, verbal

Duration varies

You dance, Striding up to half your Speed. At either the start or end of your Stride, you create an area of magical darkness in a 10-foot burst centered on your location. This area is filled with magical darkness that works the same way as that created by a darkness spell of the same level. When you create the darkness, attempt a Performance check to dance, with a standard DC for your level, to determine the duration of the darkness.

Critical Success 1 minuteSuccess 2 roundsFailure 1 round

Advanced Player’s Guide, page 193.