|Although this article is based on canonical information, the actual name of this subject is conjectural.|
The Protective Barrier was a powerful barrier spell which conjures a solid wall of energy. It called upon the power of Minerva, goddess of wisdom and defense. This spell was employed by Willow Rosenberg to protect the Scoobies and the Potentials from the Turok-Han. Willow used it again to stop Kennedy from following her.
Though powerful, it appeared to be easily broken by beings with immense strength, such as a Turok-Han. However, it is arguable that Willow intentionally let it fail because of their plan to lure the Turok-Han into the construction site.