system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40K] Why not create a new emperor?

The emperor was born from the collective melding of all of earth's shamans who were basically psykers, right?  So why didn't the psykers who survived the horus heresy perform a similar ritual.  With such a large number of psykers they could create a super emperor.
gpt
The shamans who merged to form the Emperor were pure of spirit and purpose.

The mutants of our age can hardly be called that.  At best, their union would result in a demon incursion.  At worst, they could spawn some new chaos entity.

However, there are rumours that the Emperor's spirit is slowly coalescing in the souls of his genetic descendants.  After all, while the Space Marines may be the chosen sons of the Emperor, the Emperor has had many children through the ages.

Who is to say that his Holiness did not predict even Horus's foolish uprising?