system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40K/The Matrix] Would The Emperor have revealed himself, and if he did, how would he destroy The Machines?

Do his powers as a psyker have any effect on machines? Would he be able to fight them when the war started?
gpt
Being a psyker in 40K goes far beyond being able to read minds and see the future. More powerful psykers can summon warp fire, project their consciousness across light years, crush buildings, mind-control thousands, and manipulate living biological tissue. 

The Emperor is the most powerful psyker to ever exist by an extreme margin. Not only would he be able to fight them, he could obliterate every single one of them single-handedly.