Mysteries of the known world
Far in the north of the known world lies a large wall. Adventurers, brave enough to travel there, report it is guarded by ghostly warriors wearing black.

They dedicated their lives to guard that wall. They have forgotten since when they guard. They’ve forgotten for who they guard. And they have forgotten why they guard it. It is the task of the brave adventurers to find out

Is IT real or its just a joke if IT is real pls TELL me what version do i need

And 1 more question is three aby triton dungeon od not pls add some or TELL me how to

Well, it is a description of the wall in the north (in CQR since the first release, located at Z = -8000 by default (8000 blocks north from spawn)), it is more like a reference.

If "IT" is a reference to the thing mentioned to be beyond the wall, it is a joke,

I don't get your second question.