Appearance/discussion of Necropolis units.

No way... That's only if you're really desperate:D :D :D :D
Otherwise, you can just stick to wine....;) (red, invigorating)

Then you need to take a couple of hundred barrels of fresh wine with you to the grave. Sleep for a hundred years, drink wine aged for a hundred years, sleep for another hundred years, get poisoned by the wine, and as a result, the dying undead dies and is reborn. Again, for eternity?:)