"With two shakes of a Roc's tail..."

 Feather of a Roc (#11/30, #102/365) [EA:V2] (Curiosity)    

This is is one of the smallest of the wing feathers taken from the gigantic predatory bird known as the Roc (see Beyond the Pit, p. 109; also Encyclopedia Arcana: Volume 1, p. 69), that has been treated with a minor enchantment. Whoever carries the feather has brief limited powers of levitation in the event of a fall. If the bearer of the Feather of a Roc finds themself plummeting downwards in a falling situation - a pit trap, slipping from a mountain path, falling off a bridge - this magical curiosity will activate immediately. It will allow the bearer to float gently down to the below horizontal surface - whether it be land or water or something else - and they will take no damage from the fall. This enchantment works once and then is lost; the feather cannot be re-enchanted with this power once used.

30gp