We have added an opportunity for players with personal artifacts to have their Arifact power factors affect Wondrous modifications of the artifacts. In order to do so the player needs to purchase a Platinum Bar (sold at the same shop Extractors are being sold at) and have it in their possession when they add an essence to the artifact.
The Wondrous Items page has been edited to reflect this change. Please keep in mind, that it will not be possible to add a platinum bar to an artifact while adding Reflect or Damage Shield bonus. Players who currently own modified personal artifacts will have to re-apply essences along with Platinum Bars to the items in order to get full bonus.