MCStacker/tips/en/entity.Invulnerable.txt

Set if the entity should not take damage. This applies to living and nonliving entities alike: mobs will not take damage from any source (including potion effects), and cannot be moved by fishing rods, attacks, explosions, or projectiles, and objects such as vehicles and item frames cannot be destroyed unless their supports are removed. Note that these entities can be damaged by players in Creative mode.