If the level of the body was over 300, even with low magic skill, you could still create a strong undead.
"Death Knight, Lace, Wight, Banshee or Spector. I wish I could call those monsters, but ......"
The Origin of the Skeleton had the tendency of a wizard, making the primary and secondary steps of the Necromancer's undead summoning magic spells simple to use! Only step 3 of the Necromancer's undead summoning magic spells had a limit.