The Lord Who Levels Up by Devouring

After the continent is destroyed and humanity’s last hope is defeated, Adrian absorbs the heart of his dying friend, the Hero Ian, using his unique ability [Devour] and travels back 15 years into the past. Armed with his past-life combat experience, a mysterious Player System, and the ability to endlessly grow stronger by devouring others’ powers, Adrian begins his journey to hunt down those responsible and consume their hearts.