Exclusive Property: Mr. Mu's Favorite - Chapter 4

I was proposed to by the Final Boss.

Violet skies, a world undergoing massive changes, a deficient moon, interlinking voids…

He lived from BC to the Middle Ages, from the Renaissance to the Industrial Revolution, and from Cyberpunk to the Interstellar Age. He has been a king and a prophet, a knight and a nobleman, a versatile artist, a genius inventor…
This is a four-thousand-year human epic——
“To us four thousand years from now:
“Is the world at peace? Is famine extinct? Can people touch the stars? How long is the human lifespan? How far is the boundary of the earth? Human…do you remember us?”
——Excavated from Earth Age Tenth Century BC, Solomon Prayer Book.

- Description from novelbuddy

Ally level 8,6,6,6! Enemy level 6,5,4…0?