While wearing this cloak, you have resistance to force damage, and you have immunity to damage from the magic missile spell.

When you take force damage, you can use your reaction to gain immunity against that instance of the damage, and you regain a number of hit points equal to half the damage you would have taken. Any excess hit points regained become temporary hit points. Once this reaction is used, it can’t be used again until the next dawn.

Notes: Resistance: Force, Warding, Outerwear