This is a new mission in the Samhain 2013 event. It's a side mission started in the Mansion in Blue Mountain. This mission awards you with Eleanor's spooky story which is one of the 10 stories needed to complete the Spooky Stories of Solomon Island mission.
Eleanor Franklin has written a story for Danny's compilation. Read the story and authenticate it.
Reward: 74,800 XP, Eleanor's spooky story, 10,000 Pax Romana, Sack of Penny Dreadfuls
Read the story, then head into the Bog. Look for a friendly mob called The Fool's Light. Click on it to have it disappear and spawn The Lantern Man, then defeat him. Like all revenants, this quest mob has a frontal cone attack and can repeatedly respawn.