Plot armour
From Jenny Everywhere Wiki
The Collective of the Retconning Crocodiles owned literal plot armour, which they donned during the race for the Frost King's treasure in the mountains of Manik. (PROSE: The Frost King's Treasure)
Behind the scenes
“Plot armour” is a colourful term for the concept of fictional characters' de facto invulnerability in early stages of a plot, allowing them to survive arbitrarily dangerous situations by authorial fiat because their survival is a narrative necessity.
