It's for the best, really, since Diplomacy is borked to begin with and the last thing we need is for everyone to start conniving ways to generate loyal slave clones of their 'unique' characters.<br/><br/>EDIT: Actually, I've already figured it out. Unless Kunoichi's quote there is incomplete, then a mirror copy who kills its original and escapes to the real world is permanently 'real', even if the original later returns to life. So all you have to do is go to the Plane of Mirrors, wait for your clone to show up, and Diplomance them into being a friend. You suicide, they can now leave the mirror world, and your Contingent True Resurrection triggers the next day to let you return to your domain with a new loyal identical twin (attitudes modified by Diplomacy, unlike Charm or Dominate spells, would not revert on death). Repeat ad nauseum and roll Reflex vs. thrown DMG.<br/><br/>Or just have mirror clones, like Ice Assassins, be immune to Diplomacy.