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.
Magic Feather has built-in compatibility for Baubles in 1.12, and Curios in 1.16.
You can also check out its sister mod, Configurable Beacons, it will let you configure the area of effect of a beacon.
You're free to use this in any modpack.