After returning from a circuit of Undead Paradise, Han Shuo spent several days recovering. Once his Mental Power was fully replenished, he captured a few Magical Beasts in the Dark Forest and brought them back to continue practicing Soul Tremor.
At last, one day, Han Shuo could manipulate his Mental Power at will. He fired off a Soul Tremor spell, and a Magical Beast collapsed, blood spilling from its mouth and nose.
Once he could freely control his Mental Power with Soul Tremor, Han Shuo had mastered every Archmage-level spell. He then began studying the spells required of a Necromancy Archmage at the next level.
First and foremost were the spells for summoning Bone Demons, Old Ghouls, and Mummy Lords. The further a Necromancer advanced, the higher the rank of the undead creatures he could summon and the greater their variety. At his level as a Necromancy Archmage, Han Shuo could summon these three kinds of undead creatures: Bone Demons, Old Ghouls, and Mummy Lords.
Although they were called three summoning spells, there was little fundamental difference between them apart from their incantations. Bone Demons, Old Ghouls, and Mummy Lords were undead creatures of the same rank. Though their Soul Marks differed, their strength was not far apart. As long as Han Shuo mastered the spell for summoning a Bone Demon, he could summon the other two undead creatures simply by changing the incantation.
However, just like Soul Tremor, every spell became harder to master the further a Necromancer advanced. The insights into Necromancy that Han Shuo had previously obtained from the Necromancy Archmage Clayton were now entirely useless.
From this level onward, Han Shuo had to slowly research every Necromancy spell himself. Fortunately, the Death Cemetery contained a complete collection of books for him to study, including countless volumes