Dragon Nest: Tales of The Wicked

There was the time where all of the races live peacefully, in a world of Goddess creation named Althea before her sister Vestinel poisoned her because of the jealousy over the bright world Althea has made and put her world into chaos by sending endless troops of monsters and corrupting the world by her poison. All those memories are now appear as a fairytale in our world, the only escape from cruel reality our people faces who seek the end of Dark Era. The only hope that remain for all of us is one day, we will finally able to defeat the Goddess of Darkness and bring back the light that has stolen from us. One day, The Oracles who reads the Dream of Goddess Althea found themselves reading a serious omen about the appearances of Heroes, and one of them happens to be an Assassin, who has a freedom soul nonchalantly continues his life without knowing the cruel fate awaits for him.

(Disclaimer: i do not own the game nor the cover image, image found in https://www.zerochan.net/1102272)