Dragon Temple (InstanceTopic, 19)
From Compile Worlds
The Dragon Temple was a dungeon in Madou Monogatari Big Kindergarten Kids, and is also featured in Compile Worlds. In the aforementioned game, it is the location of the seventh Secret Stone, which is obtained by doing a fetch quest for Leviathan after pissing him off. In Compile Worlds, the temple serves a similar purpose, being where the Puyo Spirit Charyl was eluding Camus. Arle Nadja and her party arrived just in time to witness Camus sealing her away in an Altar room. Since it's been nearly ten years since Arle and Leviathan fought, it's also devoid of any obstacles other than a series of dark, underground tubes pathways.
Compile Worlds also added some backstory to the temple, by having it be the result of Draco Centauros and Satan's ancient Abysian ancestors, in order to honor their dragon-like appearance and expert digging skills.