Some monsters are non-corporeal, having no physical form but composed mainly of magic or energy. While they are in this form, they are Immune to normal Weapons, and cannot be affected by most magics. They may move at a normal walking rate and may pass through objects if the object is not living matter (wooden walls are fine, but trees are living and cannot be passed through).

While walking through an object, they may not change directions. They cannot float down through floors, walk through walls at an angle, nor stop inside a wall or walk backwards through a wall. They cannot fly or move up through an object. They cannot carry or move objects they aren’t already carrying.