When the bones from reanimated skeletons are compared with ordinary bones, they found something interesting.
The composition of ordinary bones were similar to common minerals, while something had definitely changed in the reanimated bones.
Some kind of strange energy covers these bones like blood vessels. This was no doubt what allowed the bone to move.
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To test my preliminary theory, I decided to take some on-site samples.
In an effort to be objective, I decided to aim at the Hidden Rock Village in the Black Swamp in addition to the Meteorite Crater. The dead spirits there would make a perfect control group.