Mithral weapons can be forged by only master craftsmen and for roughly 500gp + (10 x base price) and have the following properties:

• If the weapon is Heavy, it is no longer so.
• If the weapon isn't Heavy, it becomes Light and gains the Finesse property.
• +1 to Attack Roll.
• If the weapon is Two-Handed it is now instead Versatile. Consult the table for damage changes.
• Is a magic weapon for purposes of overcoming resistances.