The story of Fyzan the Soul Stealer

You are Fyzan, a wretched human who was struck by a stray decay spell and is being kept alive by Gornun - Demon of Despair. Fyzan and Gornun made a demonic pledge for Fyzan to always create despair, fear, and hopelessness in his wake whilst Gornun will give Fyzan power and heal his wrought decay. After destroying the Thyman Empire, Fyzan sets off destroy all existing empires and deity.