Double damage with guns while sneaking, can be improved quite a bit. Max of 10x melee damage while sneaking with a melee weapon. Can plant grenades etc in peoples pockets while you're sneaking. And there's a mod for power armor that turns you invisible while crouching lol
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And there it is... Thank you for enlightening me, so much to take in as a newcomer to this series
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Plus extra damage for silenced weapons and you can instantly kill a sleeping person with the sandman perk. It's good to play a stealthy character