Caligar

Can only be accessed through the quest "finding Caligar" given by Kelly in Aston. Simply click the scroll she gives you and you will be teleported to the outside of the Caligar camp. To get inside you must kill the Gaurd for his key and then enter the forest below the teleporter to the south of where you spawned in, behind the teleport building will be a secret entrance, go in and click the hole.