Created by necromancy, and traditionally placed in above ground tombs with rich grave goods to ensure grave robbery, the necromancer who was paid well to create this Undead deliberately spreads stories in the right ears of the fine Funeral Gold and Grave Silver to be found in the tomb. Historically, most graves with objects of value were robbed whilst the body was still fresh. When the grave robber robs this particular grave, the LifeStealer will rise and try and kill the robber, both with bare hands and with any weapons he or she may have been buried with. Depending on how soon the tomb is robbed, the LifeStealer may be fresh in appearance, with few or no signs of rot, or a decaying body crawling with maggots and blind or near blind. The fresher it is, the stronger it is. Every wound it gets in, will steal the life-force from it's foe, and it gets stronger and less decayed as it's opponent grows weaker and less able to fend of it's attacks. Should it kill it's foe or foes, the LifeStealer will look like a sturdy, middle aged or young human who is not in the least bit Undead.
The time it stays this way varies, depending on the climate and the length of time it lay in the tomb but between twenty-four hours and a month afterwards, a small part of the LifeStealer will start to rot. If the LifeStealer kills somebody else within a short time, the rot goes away again, until it once more comes back. If the LifeStealer refuses to carry on killing or is unable to, he or she will rapidly decay until the tendons snap and the mind ceases to function and all that is left is a twitching, moaning, badly decomposed body.
To kill a LifeStealer permanently, it's head must be cut off, or it's limbs removed, otherwise it might be a threat to anyone who finds it later on.
A PC has been killed by one of these Undead, and shortly afterwards seemingly comes to life again, only to start decomposing within days. Should he or she be attacked during this time and kill the foe, the decay will vanish only to start again soon afterwards. There is a holy place where the person can be cured, but it is weeks away before they can reach it. The PC must carry out various murders on the way there and avoid law enforcement and/or bands of vigilantes on the way. Or maybe he or she needs to seek one of 30 Legendary Antidotes/Cures to rid himself or herself of the Undead taint. Or the assistance of a priest of Mathom, the God of Delays is needed but all sorts of things are getting in the way. Can the PCs find the priest in time before one of them is uncovered as a murderer, an Undead, or both?