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FileRuin image.png|thumb|Ruins in a Jungle Biome.]]
The '''Ruins''' is a dungeon-like mini-biome. It is useless until the player beats the [[Tiki Totem (boss)|Tiki Totem]] [[boss]]. The Ruins has its own unique chest that can be opened with a [[Ruin Key]], which is dropped by [[Ruin Ghost]]s. The ruins also has a boss, the [[Ancient Dragon]], which is summoned similarly to [[Golem]].