Royal-Blue Feather

 is considered a Resource Curiosity item.

Item description
"Light as a thought, and jewel-bright."

Obtaining
 can be obtained from
 * Blue Prophets by selecting the 'Recover Feathers from the Prophets' option.
 * Milliner Bats by selecting the 'Scavenge the bat-feathers' option.

Usage
 has the following uses:
 * Can be sold at Licensed Exchange in Khan's Heart for
 * Can be sold at Wolfstack Exchange in Fallen London for
 * It can be used during the Merciless Modiste storyline.