Jades are Lurkers. Their method of consumption involves dissolving their prey's insides and drinking them, like spiders.
They look human, but when they turn into the monster (or "go Jade"), their appearance changes: their eyes are red slit pupils on black, their lips and tongue turn black, their nails curve out into thick claws, and their teeth transform into wider, sharper, shark's teeth. One is born to be a Jade. The trait descends through the female line in the family.
Jades apparently have a sweet tooth.