[i]Necromancy, as stated above, requires the expenditure of one's own mana or soul essence in order for rituals to be considered successful or even function properly. This is permanent unfortunately, and weakens the practitioner in the process. On the bright side, servants made and corpses raised via this process are notoriously hard to put down, with some of the safest ways either being to undo the spellwork holding the dead body together on the mortal plane or simply destroying it to the point where it cannot reconstitute itself. Grinding the undead servant into dust, burning it to ash, or hacking off its limbs and separating them from each other are just a few of the most frequently used methods in regards to the latter option, with the choice to do each making it increasingly difficult, if not downright impossible, for the undead in question to reform depending on the circumstances.[/i]

The undead servant lore. Let me know if I should change or even remove this.

And yes I have taken holy magics into account, I just haven't wrote their interaction with the "dark arts" yet.