You create a 15-foot radius sphere of shadow magic centered on a point within range. The area appears to be wreathed in swirling shadows and darkness, and is easily identifiable when it is in an area of bright or dim light. The sphere spreads around corners, and each creature that ends their turn within the area becomes invisible. This invisibility ends for a creature if they attack, cast a spell, or leave the area. Anything they are wearing or carrying is also invisible as long as they are.