Semper Alea Iactas
The bones of the dishonored dead are referred to as fetishes.
Fetishes are most often created by a ritual cast over a corpse. This ritual consumes the corpse in a fast burning, cold flame. Often, especially if the person was particularly virtuous or wicked, several small bones will remain unconsumed. The stronger the virtue or vice, the more bones remain. These bones are called fetishes and provide arcanists their power.
Instead of entreating the spirits of the virtuous for power, wizards strip the energy from the bones of the dishonored dead. This slowly consumes the bones (and the spirit) in the process.
This is the most terrifying fate imaginable to most people. True death comes only when they are either completely forgotten by their family or when their bones are destroyed (most often through wizardry).