This rare item looks like a fist-sized, faceted diamond. If set upon any solid, level surface, it floats upward to stop 3 feet above the surface, emitting chiming sounds at random times and glowing with a pulsing, white, internal radiance. The stone is actually a cut-glass construct, but it emits a powerful effect.

A weirdstone prohibits all phasing, ethereal states, translocational magics (such as teleport, pass plant, and dimension door), scrying and divination magics, and astral travelers from occurring within, entering into, or looking into, a 6-mile radius of it. This prohibition includes psionics, spell-like abilities, and natural creature powers, such as the abilities of phase spiders and xorn. The spherical area of effect extends overhead and underground when the weirdstone is activated; the area is simply closed off.

A weirdstone can be deactivated by the touch of the being who activated it, who may seize and place it in a pouch or on an irregular surface, whereupon it is deactivated. A weirdstone can also be deactivated by breaking it. It has one HP slot