Xenon’s Brilliant Mark

You choose one creature with in the range of this spell that you can see. Until the spell ends, the target sheds Bright Light in a 15-foot radius and Dim Light for an additional 10 feet. The light can be colored as you choose.

Covering the object with something opaque blocks the light. The spell ends if you cast it again. The spell ends if you can no linger see the target.