Ashen Realm

Ashen Realm is a post-apocalyptic LitRPG series where humanity is threatened by monsters called the Ashen that invade through portals. The series begins with Ole, a young man betrayed and left for dead in the monster-filled Ashen Realm after discovering a unique skill on his birthday.

Armed with only a broken knife, he must survive in this hostile new world, unlocking skills and discovering the realm's hidden secrets. His initial goal is revenge against the man who betrayed him and to return home. He forms a guild, the Knights of the Ashes, researching new technology and battling the Blue Order as he seeks to protect humanity and learn the truth about the Ashen.