The caster momentarily becomes a shadow (A huanoid shape absent of light, not an undead creature). You can , or through any other tiny opening.er a door, through a keyhole. All of your equipment is trasnformed with you, and the caster can move up to his/her full speed for the spell's duration. While in this form the caster has advantage on Dexterity saves (Stealth) made in darkness or dim light and the caster is immune to non-magical bludgeoning, piercing and slashing damage. The caster can dismiss the spell by using an action to do so.   If the caster returns to his/her normal form in a space that is too small (mousehole, sewer pipe etc.), the caster takes 4d6 force damage and is pushed to the neraest space within 50' that can hold him/her. If the space is more than 50' away, take an additional 1d6 of damage for evverya dditional 10' of distance.