Why Seth is holding a banana

Yeah, she was right. I know why.  Oh right. Found here...  again...

Ok, Seth was breaking into a centaur fortress called Grunhold. He had to trick a troll into letting him take the horn, and aparently cave trolls have serious senses of humor. so he was like, "I'm going to play a joke on the centaurs! I'm going to trade a banana for the Soul of Grunhold!!!" (The Unicorn Horn's name was the Soul of Grunhold.) Anyhoo, the Troll was impressed enough to let him take it.

Found out.