An autocrat is you, Mr. God-Emperor :P
https://www.merriam-webster.com/dictionary/autocrat
Grey is wrong, though: we don't have last wills. Plus, God's kill is theoretically instantanous, which means there is no need to say who you're targeting to avoid playing with the Vigilante: it's literally a smite out of nowhere. Claiming God before using the kill could be a good idea if you want to be confirmed by the kill, though.
By the way, Grey Swan, dir, why are you elaborating a mechanical way to play the game without reading the setup? :P