Umbral Transformation

You transmute one nonmagical object of up to 50 lbs. that you can see into shadow-stuff. If the item is attended, its possessor can make a Wisdom saving throw; on a successful save, the item is unaffected. Otherwise, the item is transformed.

A shadow item has an indistinct, shadowy hue when in dim light, but it can be used normally in such light. In bright light and darkness, the item becomes barely visible, insubstantial, and useless; it functions only in dim light. A shadow-stuff item is destroyed instantly if it is exposed to true sunlight.

If you maintain concentration on this spell for the full hour, the transformation becomes permanent.