Lei-Ach demon

Lei-Ach Demons are demons that are prominent in only one Buffy episode; "Family". They lurk around hospitals, sucking bone marrow from patients. Glorificus recruits the demons to kill Buffy. However, when they arrive at The Magic Box, none of the Scoobies can see them because of the spell which Tara casts, making all demons invisible. Nonetheless, Tara reverses the spell and the Scoobies manage to save themselves.