As relatively recent additions to the Wardens of the Grand Stair it is important to make allies amoung those whom understand the forces of Umbra and Eidolon and the intricate ways in which they interact.
It is with this is mind that when Lucien, one of the most established of the Gossamer Lords requests your assistance with a small matter you accept, knowing full well from his reputation that the mission will without doubt be more dangerous then he has suggested but his gratitude and patronage will be invaluable to you future survival.
The task in hand seems simple enough – Lucien has a key which he assures you is not for a Door on the Grand Stair but for another opening within one of the endless Gossamer worlds. He has located which Shadow Realm whatever the key opens resides in now, you are to enter and find the location using the espy device that Lucien has given you.
Well, that and the Hi-Tech diving suits!