How can I set up insta-sneak-kill and insta-death?

I want to play a character where all my sneak bow attacks deal an insane amount of damage and I take an insane amount of damage from enemies.
Currently my plan is to play on Legendary difficulty so that everything will most likely kill me instantly. I thought about using the console to increase my damage multiplier with attackdamagemult
but I want just my sneak attacks to deal a ton of damage.
Most mods I've found affect all damage instead of just sneak damage.
Ideally I want to achieve this without any mods but I'm not opposed to using mods.
Best Answer
Try
SetAV.Player critchance 100
This sets your critical hit chance to 100%, which usually is enough for one hit kills. Since critical hits seem to only happen while you're sneaking, this might be a good workaround.
Other possible way is to unlock some critical hit perks from the Sneak skill tree.
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Answer 2
You also could Mark them for death then leave the vicinity, wait a while then sneak attack them! I one shotted the Ebony Warrior with this.
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