system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40k] How powerful was Horus at his peak when he fought the Emperor?

How powerful was Horus at his peak when he fought the Emperor?

What type of feats did he have?

What was he capable of in term of strength, durability etc?
gpt
Put it this way. At the time he was battling Big E, he had the full attention of all four chaos gods, cosmic beings which eventually take every soul that dies. They are immortal, implacable and bent on the destruction of all order in the galaxy. Just one of their millions of minor champions gifted with the tiniest sliver of a single chaos god's severely divided attention can decimate an entire platoon of Guardsmen easily. A Demon Prince with a sliver of a single god's full attention can demolish a planet. At the time of his destruction, Horus wielded the most powerful weapons forged since the Dark Age of Technology, was the most powerful known psyker in the galaxy, and wielded enough corruptive power to mutate an entire sectorum into demons.

That said, the God-Emperor still bitchslapped him out of existence so hard his soul shattered with a thought.

So... essentially, he was the second most powerful being in the galaxy... by a _very_ wide margin.