system
Given the following post, respond as if you're commenting on Reddit:
human
[40K] How did the Emperor's battle with Horus kill him?

I know next to nothing about 40k, but a bunch of my friends are into it and were explaining the main storyline to me. They all told me that the Emperor died not long after his battle with Horus (which he won). How? Isn't the GEoM like this all powerful dude?
gpt
Hes not literally all powerful. If he was there wouldnt be much of a story. Anyways, sonce Horus was his son, he was basically heartbroken and reluctant to kill him, and only did so when Horus mortally wounded him.
 
Also, he didnt die. His body is decaying, but his spirirt still resides in it, and is simultaneously holding the eye of terror shut as well as powering the astronomicon.