Divinity: Original Sin has some Easter Eggs within the game that can be found all over the place.
Location: Hiberheim Prison
Reference: A donator from RPGWatch who earned an NPC in the game.
Nine Inch Nails Edit
Location: Mortician's Morgue (first floor), Cyseal; also found and sold throughout game.
Reference: An American industrial rock band founded in 1988.
Rob Zombie Edit
Location: Outside the North Gate of Cyseal near a bail of hay and a dead cow.
Reference: An American musician, film director, screenwriter, and film producer. Member of White Zombie and solo artist.
Hanneman's Axe Edit
Location: Hidden in Hall of Heroes at Homestead. A fairly high Perception is required to discover it.
Reference: Jeff Hanneman is an American musician and one of the founders of the thrash metal band, Slayer. He had his own signature guitar.
Psi-Powers Skillbook Edit
Location: Zandalor's House, on top the fireplace mantel.
Reference: This book is unobtainable, it is a joke from the Devs. Supposedly the joke is to get the book you need Psi-Powers that the book provides.
Spider Pig Edit
Location: King's Tomb
Reference: Homer Simpson's pet pig, Plopper, in The Simpsons Movie. "Spider Pig! Spider Pig! Does whatever a spider pig does!"
How to Obtain: Crafted from Weresheep Wool.
Boo Rattley Edit
Location: Black Cove near the entrance.
Herring Quest Item Edit
Location: A single herring with the Quest Item tag. (Somewhere in Cyseal?)
Reference: Monty Python and the Holy Grail - The Knights of Ni task King Aurther with cutting down the mightiest tree in the forest with... a herring!
Larian Wagon Edit
Location: To the southeast of the poison log in the Phantom Forest.
Reference: Larian is the company that created Divinity: Original Sin! Unknown whether the strange group of characters nearby have any significance.