forgive me for supernatural posting into iron lung fandom but
For some reason, I cannot help but imagine Simon when he was the Butcher wielding a bone-knife to carry out his murders for Eden. I feel like there's something incredible powerful about it, especially if the bone was fashioned from an animal jaw or something. Said animal, obviously, no longer exists.
You are being murdered, sacrificed, with the bone of a fallen creature that once sustained your kind. Your body will become the soil that will blossom into the tree. Like the lamb before you, you will be slaughtered, and every part of your body will be used for mankind.
All of humanity that remains, exist in space stations. Everything left behind with humanity are just salvaged scraps. Metals and fibers and glass and gruel - no longer are there plentiful plants or livestock.
The Butcher arrives with heavy steps, a Son of Eden. There is nowhere left for you to run, no one left to hear you scream. He raises his blade, and in that dim shitty fluorescent light, you see it: Bone, the jaw of an animal. Primal instincts flood with death, death, death. You will never see another one of those creatures again. You will never breathe again. Everything you've ever known is gone, and you will die screaming.
In a way, it's almost beautiful. Long gone creature tastes lifeblood once more upon its dead jaw as it digs and digs into your body. And once you're dead, your body will become the soil.
The knife inspiration is called "The First Blade", and it's from Supernatural. It was created by Cain, The Father of Murder, and was known to be able to kill any creature on the planet (so long as its wielder was empowered by the Mark of Cain)