Lucifuge (ルキフグス, Rukifugusu) is the 3rd demon of the Reverse Kabbalah.
It was located in Damudo originally. Yuria obtained the nucleus containing Lucifuge while she was playing in some ruins, accidentally binding it to her left arm. It has the ability to cloak itself from another dimension, effectively masking its presence. Also, whatever is consumed is sent to the other dimension.