SPOILER A New Jungle Easter Egg?

I was walking through the jungle village and noticed this cave.

As I walked in, I found an old, beaten-up library.

Upon exploring this library, I found a tiny passage.

Going in takes you to this coal teleporter.

It teleports you to the "Legend Keep" that contains Level 55 neutral Legend Keeper Golems and a tier 2 loot chest in the middle.

At the end of the hallway there is a door with a button. The button, instead of opening the door, teleports you to an arena with a Level 55 Matryoshya Idol. Once killed, the idol automatically spawns a new idol.

There's a door at the end of the arena that contains a coal teleporter. It teleports you into this building.


What are your thoughts on this? I have no idea if this was found before.

 

Already found, though how to get there wasn't very well documented.
The boss drops a 15-slot legendary chestplate.

 

HOLY SHIT

 

@Witcher
Bruhhh c: