They would be quite useful (and probably common) in a wizard's lair, but with their disability to pass even small obstacles, I think they wouldn't be very useful in the outdoors?
Jumping Nails: Like centipede nails, they can be hammered into the bottom of an object. When commanded to jump, they will release a spring-loaded that will propel the item they are attached to upwards. Jumping nails function similarly to centipede nails, in that the more you attach the more jumping power you get. In addition, they can be used alone (usually as a joke) or in combination with centipede nails (they will curl up out of the way, so that they don't create drag or obstruct the centipede nails in any way).
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What a neat - little :) - idea. Of course it makes some assumptions about the metaphysics in your world - that fairies 'can' be undead.
This has great potential for a scenario in my campaign! The fae play a large part in the campaign and this would be a useful sidequest, particularly with Strolen's idea to incorporate Fairy Luck as well. Thanks, Agar.
Lifeforms (Constructed) (Any)