Tyzuris
Primarch to your glory& the glory of him on Earth!
Basically assume that upon teleporting to the Vengeful Spirit, Dorn meets Horus first and dies fighting him, then the Emperor arrives and gets wounded and gives the same set of instructions to Sanguinius to put him on the Golden Throne.
How will this affect the course of the Great Scouring?
How will this affect the course of the Great Scouring?