Feathren

Intro
Feathren is an obsolete spell component which is formed from the feathers of several birds, combined using transmutation magic.

It was elvish in origin and was popular (if expensive) during the time of The Elven Empire. Simpler and more inexpensive substitutes have since been found, and feathren has largely fallen out of use.

Feathren can be represented by a symbol that looks like a wing.

Uses
Feathren was most often used as a component for spells involving transportation or speed - or, more broadly, spells that involve "going".

It's thought that there was an element of superstition to feathren's erstwhile popularity, wherein the combining of feathers in its creation was viewed as "[capturing] the essence of all these different flights of birds within it." (Polska, (2x4))

"The Wending Way" (2x2)
Using a book at the Wending Archives, Godric was able to identify the symbol for feathren in his father's notes.

"Wendingsfael" (2x4)
Polska educated Godric on feathren's origins and uses. She explained that her shop had not stocked feathren in decades, but suggested that a certain collector in The Dark Quarter might have some.