Potion of Invulnerability

Brew it with a Nether Star Fragment to get 30 or 90 seconds of Invulnerability, dependent on potion level. This contains all damage type immunities, Arrow deflection, Drowning immunity, knockback immunity, and your armor will be immune to damage as well. Replaces Effect bubbles to Wither Immunity shield when applied. The hearts in your HUD would turn white. You can't eat, drink, Regen your health, nor have hunger immunity, because when applied, it remove all food and other effects. This makes you a very temporary mortal God/Goddess. The attacker will waste their weapon's durability.

To get the Nether Star Fragment, you must break apart the Nether Star itself, but it will have to be one fragment per potion.

 In PvP Miniservers, it would be useful. Miniservers are running by using a person's local storage. Back in my day, I used Instant Health effects in Command blocks to make everyone Invulnerable to attacks, but in this Bedrock update, They're not invulnerable anymore.