Knob of Lord Nimbus, it's a silver ornate knob with a spike on the end. Once per day When applied to a large surface of wood or stone, the knob once inserted creates a magical door too the castle of the great dragon Ryder Lord Nimbus. It will take 24 hours until the door can be removed from the surface applied to. Now deceased for many years his castle lay dormant with house elves, that are tethered to the structure to serve it's lord. The castle set upon a small Rocky island in the middle of the sea. Legend says that Lord Nimbus kept a dragon egg for himself, and stored it in his castle. Ancient relic,
weights 5 lbs, can be used once a day, To go back and forth. Takes 24 hours to attune to it.