Does it need to be noted as a superpower within the story? If not, I'm saying plot armour. I get to be safe in the knowledge I can't die or be taken out of action unless all plot threads that need me are resolved ahead of time.
The main character of the novel "Infinite Mana in the Apocalyps" literally has the traits "I'm the Main Character", "Plotarmor" and "Nexus Events", so you are good with that choice.
It doesn't make death traumatic. It makes death impossible until a certain point in the narrative, and then death can happen however the author chooses. It means I won't be killed stupidly through a random accident while I still have unfinished business.
Okay, but the trauma would happen normally anyway. It's like saying helmets increase the risk of head wounds.
And no matter how much it hurts, I'll still be healthy enough to keep going with the plot. I get hit by a car, roll over the bonnet in a comical style, then stand up and stumble my way forwards once more. That's actually LESS trauma than, you know, death.