Magic Feather is my take on a more balanced Angel Ring from Extra Utilities.
It adds a feather that grants the player creative flight while within the range of an active vanilla Beacon.
This allows the player to enjoy the benefits of creative flight while building, without making exploration trivial.
If you wish to configure the range in which you can fly, check you Configurable Beacons, it's a companion mods that gives you more control over how beacons work. (You can change the range without it but it's better with)
You're free to use this in any modpack.