Demon Lord

Demon Lord, a very particular subspecies of the demon race. Demon Lords are notoriously difficult to kill, and they are even able to resurrect if slain. These are not true resurrections but more like their remnant energy regathers, and an entirely new creature with a new Truesoul is born in its place, though at a slightly lower level in most cases. Due to this, many just seal away Demon Lords instead. In the end, time kills everything that is not a god, no matter how tricky they may be.

They also have inherent knowledge like a True Royal, but it is very limited, so for one to be able to speak is already proof it has lived for a pretty long time, and even if all Demon Lords are born C-grade at minimum, being halfway to B-grade may mean it has gained those levels itself. Demon Lords are also usually born through large-scale sacrificial rituals, which means they usually have subordinates.

They can still die permanently dependent on the way they are killed, and the amount of times they resurrect is still limited. The problem is that you can’t really know how many resurrections a particular Demon Lord has left, hence why most prefer to seal them.

When a Demon Lord dies, its Truesoul would disperse, leaving behind just energy and a shattered soul embedded within that energy. Based on what Dina said, the unique Demon Lord energy was something no one truly knew how to control or manipulate. All they knew was that given enough time, a new Demon Lord would spawn somewhere in the relative vicinity of where one died. Sometimes it was as far away as on the other side of a planet, and other times it would be right where the original died.