I am the first one to discover the Creepy Dog easter egg from Harmony Island. (nvm)
To find this, go to harmony island, but don't go to the rune run. instead go to the left of the big crystal that takes you to the rune run and go against the wall. Try to find the wall that you can walk behind. Walk to the other side, and go up. You will reach the point where there is the Creepy Dog on an island. Someone else document this, please. (P.S. like my Shivertusk?)