Necromancy manga

Yeon-woo had a twin brother who disappeared five years ago. One day, a pocket watch left by his brother returned to his possession. Inside, he found a hidden diary in which was recorded "By the time you hear this, I guess I will be already dead."

I want an S-Rank skill too! I want it so badly, I could die for it![You have awakened an S-Rank skill.] [But it only works when you die.]HUH!? WHAT'S THE POINT OF GETTING ONE IF I DIE !?

One day, the world transformed into a game.'Dungeons' and 'monsters' emerged in the middle of cities, and 'players' who had received the gods' authority appeared.Se-jun Lee, the guildmaster of the Messiah Guild that would bring salvation to the world

The story of a slave, called Zion, set in a Middle Eastern setting, who is training to be a great necromancer, to be able to fight on even ground with Knights, to have his long awaited revenge as a chosen child(1 of 4) of Kronos...he became a slave o