Sky Ruins

Sky Ruins (Japanese:  Sky Ruins) is a dungeon in Pokémon Super Mystery Dungeon that is located on the Grass Continent. It is unlocked by reaching the Hyper Rank.

Upon entering the dungeon, the undefined will immediately fight both and  at the same time. When defeated, they will connect with the player and unlock Altar of Ice: Depths. Afterwards, Sky Ruins cannot be visited again.

In other languages
Himmelsruine Rovine Celesti