Medieval Warhammer: Is Tzeentch Such an Inconvenience?

When a soul from Holy Terra in the 21st century falls into the Well of Eternity, the taboos contained in the entire world collide and merge with the knowledge in his mind that does not belong to this world. What kind of sparks can be created, and what kind of extension will it bring to the development of this world? The nine-sided dice creates opportunities in chaos. Why is the Tzeentch hanging high in the Crystal Demon Realm the real Tzeentch? The journey of the Old World Continent will begin in the Oster Territory of the Empire, please witness it. Comparing the story styles of Warhammer 40K and Medieval Warhammer, I think the former is like suffocation in a metal coffin, and the latter is like a dead flower on a rotten wood. Compared with the suffocating feeling on a cosmic scale, I appreciate the atmosphere of the struggle of the countries in the old world continent that still exists. (Try to research as much as possible, but the official information about medieval times is inconsistent and too bookish, so the story line and timeline will be mainly original parts, and not knowing the background of medieval Warhammer will not affect the viewing.)