Undead.
They were a very specific kind of Monsters that were very rare.
This was mainly because of the special kind of energy they gave off—a perverted kind of Mana that very few knew of.
Miasma.
Miasma was a corrupted version of Mana, and it was its very antithesis.
Like poison, it could prove deadly to pure Mana Users, though the opposite was also true.
Since Miasma was exclusive to Undead beings, they were known to be incredibly dangerous. Hardly anyone had any sort of Skill related to such a forbidden power.
All the Otherworlders had learned of this during class, so they simply couldn't believe what they were seeing with their very eyes.
Sir Ralyks… had just summoned Undead— and it wasn't just one or two, but a whopping ten!
Each of them were different from mere Zombies or Skeletons. They had armor, special clothing, and various kinds of appearances that caused them to look different from each other.