Necromancer, but pre-collapse civilization

Good news, time travel.
The bad news is that the pre-collapse civilization is doomed to destruction.
Fortunately, Moros still has the golden finger.
Now that you've traveled through time, show off your true abilities.
"Anyway, let's set a small goal first and survive the end of the world!"
Standing in front of the gate of the cemetery city and looking at the dilapidated territory, Moros felt that he could still save it.
Dark.
He already has a completed novel, so his character is guaranteed to be good.