system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40K] I'm a human servant of the Chaos Gods and I have been tasked to travel to Terra and assassinate the Emperor. How would I do this?

I am a very influential politician from a major fortress world. Money is not an issue and I can rely on the generosity of the Gods to help me with this undertaking. I have not yet been to holy Terra but I have several contacts there.
gpt
Give up. The Dark Gods don't want the Emperor assassinated as the current state of the Imperium benefits their survival.

The mission is impossible anyway. Let's say you managed to scheme your way into the Palace, you cannot reason with the Custodes, and you certainly cannot fight them (and live).

And your lack of any hope of success only proves you aren't supposed to win. If Tzeentch were omniscient, why would he send you on an impossible mission? Because you're not supposed to succeed, merely to die and provoke the Imperium.