The Riders of Icarus site has been updated with the news that today marks the start of the Easter Day event. During the event, an NPC Bunny has hidden eggs in Hakanas and eggshells all around the game world. Players are charged with collecting eggshells to exchange for Easter Eggs. A number of monsters also drop Eggshells to help players collect the needed number to complete a variety of quests.
Eggshells can be used as trading material for a number of goodies including Elite Tempering Stones, Tagris Mark, Primeval Dust and more.
You can check out the details on the Riders of Icarus site.