The Ruler Of Darkness - Chapter 17Book 1:

Travel to the game world.

Matthew found that there seemed to be a little problem with his system.

…

“Occupation: Necromancer

Task: plant trees

Target: 1000 trees

Reward: Summoned item ‘Bone Dragon’ & a lot of EXP”

…

In this way, a necromancer who respected the way of balance more than the druid was born.

…

- Description from novelbuddy

When you're reborn as Jorah Mormont you ain't got much. A Dad looking to bale and go spend his days hanging out with the guys on the Wall, a wild Aunt raising your wild cousins you can't stand, an arranged marriage to a girl you never met with a dowry almost low enough to be an insult, and a populace of smallfolk so inebriated and incompetent its no wonder nothing's changed around here in 8,000 years. Hopefully the gold finger granted by Levid's Magically Wheel of Reincarnation can help.A really nice pair of testicles.With that, the right attitude, and a shovel I have everything I need to dig a nice grave to lay in.Or Bag End. Let's see which happens first.

Six months ago, tens of thousands of black phantom towers appeared all over the world, floating above the cities. Chemists, physicists, religious people… all of them could do nothing.

After transmigrating into a weak noble body, Marvin discovered that he was familiar with the world, this was the game he played in his previous life and… Damn! He only had six months before the Great Calamity!

As a former top player, he would obviously fight to save the world… Yeah, no. Time to plan and prepare for the upcoming events, better to use that knowledge to get ahead rather than fight with gods.

Follow Marvin’s journey through this new world.

- Description from Novelupdates