Does a narcissist ever get their comeuppance/karma for the vile things they've done? Such as cheating, smear campaign, etc.

I strongly recommend reading these articles on Quora:

Avoid Making These Big Mistakes With A Narcissist

7 Reasons Why Narcissists Won't Change

Random Eagles notes: Bryce Huff trade perhaps signals some confidence in Azeez Ojulari - PhillyVoice

Uncover 7 Key Differences Between Narcissists and Sociopaths

10 Toxic Behaviors of Female Covert Narcissists

Every time I have to drop him off I worry about my son's safety both physical as well as mental. My ex narc will spin a story around so fast it'll make your head spin. I used to have to write our conversations down so he couldn't twist my words and even then he did it. By the time he left I was a jumbled up mess who didn't know which way was up.

Seahawks defenders want to "put the team on our back" - NBC Sports

10 Actions That Terrify Narcissists to Their Core

10 Toxic Relationship Behaviours to Watch Out For

7 Ways Narcissists Discard You

Why does everyone hate Anthony Joshua so much? I get that he isn’t the best heavyweight boxer ever but people claim he’s a no skill fighter but he has an Olympic gold medal, a world championship, and beat Klitschko, a dominant force in boxing

Boy, could I write a book on the ways and how much I wish they did. Reading through these stories, I find myself amongst my brethren. It seems we all have a person in our lives who just fixated on us. Perhaps we should be flattered that our supply was just “so, damn, good”. But I don't feel like that at all. My ex narc is using our 6-year-old to torment me now, and he is so manipulative that he has our son lie to me so I can't protect him when he hurts him.

10 Reasons Codependents Fall For Narcissists

Being away from him has at least given me room to observe and call him out though this does no good as he is a pathological liar. He can't keep a girlfriend or any friend for that matter. Meanwhile, I am still trying to heal while in this war. It seems every time I think it's settling he throws more dirt and dust at me to keep me clouded. I think I am getting better. The divorce is final. I've moved on into a new relationship, but I could tell some stories, my lovies. To all who can relate to my pain and the pain of others described on this thread, you're not alone in this. Even when it feels like it. People will eventually see the narc for what they are and you will be redeemed.

T Cells Found Living in Healthy Brains - Neuroscience News

7 Demonic Doors Opened in YOUR Life Through Narcissists