Spectres are ghostly creatures that are usually found roaming at night in small groups. They appear as dark blue-coloured wisps of smoke that are charged with energy, and seem to have a 'face' of sorts.
Spectre attacks will drain the party's Soul Points, but blocking will serve to prevent this. Magic is the best way to deal with these creatures, as they are strongly resistant to physical attacks. They are weak to Holy. They are also classified as Small enemies, so aerial attacks will not affect them.