Planet Protector (星の守護, Hoshi no Shugo?, lit. Planet Protection), also known as Planet's Protection, is a recurring ability in the series mostly associated with Aerith Gainsborough from Final Fantasy VII. It typically protects against damage or provides invincibility.
Planet's Protection is Aerith's Level 2 limit break that grants the party immunity against physical damage for a time. Aerith gains the limit by obtaining Legacy: Planet's Protection from the "Aerith vs. Wild Animals" challenge in the Corneo Colosseum. This is only possible during "The Town That Never Sleeps".
Planet Protector is Aerith's Ground HP ability. It shields both the player and Aerith from damage and flinching for five seconds. Planet Protector will also protect against HP damage, but the opponent's Bravery still drops to 0. It also cancels Chase Sequences if the player is attacked while being protected, though the player will not suffer any damage. As she is an Assist-only character, this means that the ability is used when Assist and HP attack buttons are used together on the ground, but it is a purely defensive move.
The card depicting Aerith in the promotional art also comes with the Planet Protector ability.