I know I've got at least two Slayers fans in my friendslist, possibly three or four.
This is the most frightening drawing of Xellos I have ever seen. It didn't hit me at first, but when I went to bed a few minutes later, I found myself telling myself, "Don't think about Xellos' eye, don't think about Xellos' eye..."
Here is one by the same artist that isn't terrifying.