Immortality...since ancient times until now, has been a hot topic.
Even for giants and kings, despite their long lifespan, they have a limit. Supreme beings may be infinitely long-lived, but they are still eventually buried by time.
Only the taboo existence is eternal and indestructible!
Even if buried, just the thought of their information can become the medium for their return.
However, compared to the magic-less world of his previous life, this world has many methods for prolonging life, such as life-prolonging elixirs, undead rebirth, and refining oneself into a treasure...
Most conditions are harsh. The easiest threshold for mutation by the evil god allows even mortals to perform ceremonies to gain immortality or eternal life.
But the side effects would gradually erode one's sanity, eventually becoming neither human nor ghost. At that time, personal consciousness might cease to exist altogether, hardly any difference from death.
