The Old God Pentagram Edit
There is a fan based theory that the Old Gods exist in some sort of pentagram, as shown in the image opposite.
At the top of the pentagram is Yogg-Saron, following clockwise is a potential Old God that lives under the Tirisfal Glades, however this was commented on by Blizzard, saying there is something 'incredibly unsettling' but not an Old God. the same evil source which forced the High Elves to find a new land, how. The next Old God (following clockwise again) isn't directly hinted at, but it would help complete the pentagram. Next is C'thun at the bottom of Kalimdor. In Northern Kalimdor is the Master's Glaive.