Trade in 20 of these to Belgidiveau (A Ward to End All Wards) in Abyssea - Vunkerl to unlock sufficient fame to unlock Rahal's quest for the crimson celerity abyssite.
NPCs for 450 in Jeuno/Whitegate. Drops off the "new" Abyssea mobs: Clionid/Limule (Visions), Amoeban/Murex (Scars), and will most likely drop from similar mobs in the upcoming Heroes of Abyssea.