A white and black tree with bark that looks like bones and small leaves that grow in bunches that look like matted fur.  While not a particular attractive tree, it does have the ability to absorb nightmares and negative thoughts.  Many dwarfs grow small potted versions of the tree and keep them in their homes as a sort of dream catcher.  If the wood is burned it gives off a soft blue light.  If burned ritualistically it is said to exorcise or summon demons, depending on the ritual.  Also know as Oni Wood Trees.