Potion Of Leavitation

It would be really helpful for the players while they are in the end world. It's effect should be Leavitation like the shulker's attack and would help them if they fell into the void.The ingredient can be set as shulker if it is a must or any other ingredients easily obtained. The duration should also be made extendable. This would be helpful in various ways like escaping the void, felling of a cliff and so.