Upgrade Alone: ​​One Person Becomes an Army, I Will Kill All the Worlds

[If you are thrown into a dungeon where you will die at the beginning, the Shadow Lord system will be awakened when you are about to die! [Others are complacent when they awaken a superpower, but I directly transferred to Shadow Magic God, and all spells can be cast instantly without cooldown! [Others form a team to clear the map and survive a narrow escape. I clear the entire map alone. Kill monsters to extract souls. Millions of shadow legions will follow me to conquer the world!