As the symbol of the Necromancy, it is blue too....all familiars under the Necromancy magic are. It can be built up by ghosts, and has the unique ability among symbols to heal astrals of the same side, but does not attack enemy familiars. The healing occurs automatically towards astrals in a certain range, much like an elf, by casting glitters of glowing substace towards it's designated target. The Obelisk has a dim complexion, glowing slightly according to it's pace. There are also butterflies fluttering around it, and it would be assumed to be hell butterflies.