A caster, either by their catalyst or not, create a blue, large magical shield of ethereal energy which enable them to protect himself or herself from magical attacks. When used, the shield will appear in front of them in which resembles a riot shield. The shield itself is invisible, unless being hit by a magic-based attack (either strong or weak one) where it glows before becoming invisible again. However, though the shield is very effective as protection against any sorcerous attacks, it is not providing absolute protection. This was due to the shield cracks when receiving damage, and when too much damage received, it will dissappears and the spellcaster and even something or someone with him or her will become defenseless.