Smoothed black stones made from fallen meteors.

You can spend 4 hours per spell level to magically store one spell within a rune. Doing so expends a spell slot of that level that cannot be regained until the rune is used and consumes 150 gold worth of materials per spell level.

To inscribe the glyphs a DC 10 + 1n (n = spell level) check must be made using your spell casting ability modifier on a failed save the process must be repeated, on a 20 or higher the spell is inscribed at one level higher (Cannot exceed 9).

Anyone can use filled rune (using your spell save DC if the spell requires a save) if the spell hits it always does the maximum damage.