SPOILER Broken Door Or Future Dungeon ?

I found this in the canyon while exploring

 

Door to dern? ( ͡° ͜ʖ ͡°)

 

That might be one of hidden/incomplete element dungeons

 

Found that too

 

This is the Ice Dungeon. It is incomplete, there is a single chamber past there, but it doesn't lead to anything. There exist Fire, Earth, and Water mini-dungeons, essentially fully built, with bosses and puzzles and mazes and LAVA DEATH PARKOUR, except for the coal exits not working. I have heard tell of a thunder or air dungeon, but I have not yet found them.

 

I think the Ice is the aire dungeon, because there is a dungeon for every element.

 

Yeah, and Ice was used in the Air chambers of the Hive.