These strange undead skeletons, let's call them strange undead for now.
There were quite a number of strange undead, and when the first batch of undead climbed out of the ground and attacked Roy, there were still skeletons climbing out from farther and farther behind.
However, after exchanging blows, Roy quickly discovered that these strange undead were not all strong. Their strengths were uneven, and the stronger ones could reach the level of high-rank demons, but the weaker ones were only about the same as low-rank demons.
This difference in strengths seemed to reflect mainly in the age of their bones. The bones that looked fresh were stronger, while the decayed and older ones were weaker. This caused Roy to realize that the magic power of these strange undead seemed to come from their bones.
