Facethief Mask

Faces of the Fallen. This mask can hold up to three unique charges. The mask gains a charge whenever you see a humanoid creature dying within 60ft. of you while wearing it. You can use a bonus action to expend a charge. When you do, the mask reshapes and adheres to your face and is wreathed in an illusion to make your face look exactly like the person that you gained that charge from. This illusion lasts until it is dispelled, or you use a bonus action to cancel it. A creature can make an Investigation check (DC 17) to see through the illusion and discern you are wearing a mask.