File:Otherworld prealpha core biome.png

Summary
An image of The Core, a biome in Terraria Otherworld

From http://forums.terraria.org/index.php?threads/terraria-otherworld-development-is-on-fire.27864/ though for SOME MYSTERIOUS REASON otherworld's development doesn't seem to be catching fire like 1.3 was so sourcing doesn't seem as urgent

Source: