Spiders are a subspecies of Insects, defined by their eight legs and ability to create sticky webs used to trap prey. Some spiders also have massive sizes and powerful body restraints which makes escape impossible for a normal human or weak monster. They are also extremely carnivorous and will eat any meat, whether it be human or monster, and due to this they are very infamous even amongst the monster race.
High-ranking spiders are extremely proficient in magic, capable of warping space-time. This creates a personal separate dimension, serving as a barrier that prevents the prey from escaping and also allows the user to fight on their territory and thus gives them the upper hand. The dimension can only be dispelled if the caster is defeated, though it may be possible for Luka's space-time attack Flash Kill to tear it apart, however he never actually uses it against the dimensional space.