Opithar

I play World of Warcraft and from what I can see I assume expansion 1 looks druid related, perhaps the Emerald Dream. Expansion 2 is 100% related to the Nether from the look of the portal around the circle (Proof down below from the Mana Tombs in WoW). FInally expansion 3 seems Troll related because of the paints and wood. Keep in mind these are only assumptions that I have related from my WoW experience.