The absorption of corpses is merely a surface phenomenon.
The essence of its power is rooted in the control and manipulation of bones from the Plains of Bone in the Demon Plane.
This is an extremely powerful ability. If used on oneself, it strengthens the physical body. If used as a skill, it becomes a special form of attack. Imagine what would happen if a simple punch could break the bones of an enemy—that needs no further elaboration.
Of course, this is not mere speculation but a feeling that arose after the purification was complete.
This is also why, despite not being skilled in creating Magic Items, he can perfectly utilize the Purified Essence.
Just as expected.
