Invincible Pals
The Pals in your party and at your own bases can't be hurt, with an optional god mode for you. Wild Pals, other guilds and other players are never affected, and nothing is written to the save, so removing the mod removes it completely.
Why it holds upIt uses Palworld's own invincibility switch under its own name, so turning the mod off never removes protection the game gave for its own reasons. The mod reads the game's answer back to confirm each Pal is really protected.