When the Beloved of the Evil God Embarks on a Journey to Defeat the Demon King

The indescribable mysterious existence seduced the soul from another world and assisted him to cross the mountain of corpses and sea of blood to ascend to the throne and become the Demon King of the South; The alien assassin favored by the evil god transformed into a northern dragon and embarked on a journey with human warriors and elf mages to find a way to save the world. All in all, this is probably a story about a native from another world who continues to grow, makes new partners, and wants to defeat the big devil who has traveled from the earth. (The protagonist is inhuman, there is no time travel, there is no rebirth, there is no system, it's so stupid.)