Rune of the Eldritch Knight
You can imbue a weapon with a magic sigil, the rune of the eldritch knight, allowing the weapon to act as a magic weapon for the purposes of bypassing DR and affecting incorporeal creatures. This takes 10 minutes, and you can imbue only a single weapon at a time. If you imbue a new weapon with the rune of the eldritch knight, any previously imbued weapon loses this benefit. When calculating the Hit Points and hardness of a weapon imbued with the rune of the eldritch knight, treat its item level as 5 higher.