The Flügel Tiara is a bauble added by Botania. Its entry in the Lexica Botania is initially hidden until the player acquires Elven Knowledge. When worn, the player can fly as if they were in Creative mode by consuming small amounts of Mana from a carried Mana Tablet. When in flight, white sparks trail behind the player.
To equip the Flügel Tiara, press the "B" key (by default) to open the Baubles inventory GUI, where the player can equip the Tiara in the Amulet slot.