Undead evolution story.
After the exodus of all life, our galaxy is left empty and desolate. But in the absence of life, undead energy surges and beings that should only be summoned are now rising, gifted undead life by the abundance of energy. On one empty world, a skeleton comes into being. With no memories or even a personality, he is cast into a young, dangerous world. He will need to grow fast if he is to keep his new existence.