Okay if it isn't obvious to you I'll explain. Tarus is a low level noob who is invisible. Xionus is a high level character who is hard to hit because his cloak makes him effectively intangible. But also Xionus is really annoying to the Fatemaster and always pulls off these crazy plans as you will see on the next page.
Sorry the comic is a day late. I was helping out with disaster clean up in Joplin and wasn't able to post.