Many people think that everything about a legend, from hair to toenails, is legendary.
But in reality, that's not the case. Scraping some bone dust from Amberser won't cure all diseases, and feeding it to a dog as bone mud won't make the dog evolve into a high-order undead. At most, it could only poison the dog and make it rot very quickly.
It's the same with the undead of other professions.
Back in his adventuring days, Amberser had heard a joke from the old-timers: A legendary warrior got drunk and was taken by a Drow Wanderer to be sold to an ogre. The ogre said, what's so special about the loins of a legendary being when they aren't even as chewy as those from a common man he had eaten.
The authenticity is unclear, but the story serves as a warning to all adventurers not to rely on high levels alone, as there are countless ways to die in this world.
