Mask Spirits are malevolent spirits found in the Jade Empire. They are different from ghosts in that they are not spirits of the restless dead; rather, they are spirits from other planes of existence who have become stranded in the mortal world. Because of the circumstances by which they arrived in the physical world, they lack proper bodies, and thus hide behind masks and black robes.
Their attacks include a green missile as their normal attack, which will change trajectory to always hit their target, and a blue missile as their strong attack that causes knockdown. Both missiles cause damage and drain a small amount of Chi.