Es posible que desee probar el wiki español
(disculpe si hay algún error, usé el traductor)
If you inspect it it says,
"Higher beings, these words are for you alone. These blasted plains stretch never-ending. There is no world beyond. Those foolish enough to traverse this void must pay the toll and relinquish the precious mind this kingdom grants."
You don't need the dream nail to read it.
You're welcome :)
Are you talking about the door in Fungal Wastes/City of Tears? (Not the one you use the City Crest for) If you are, that door cannot be opened, and is most likely there for lore. I hope this helped. :)
Hollow Knight only has three content packs: Hidden Dreams, The Grimm Troupe, and Godmaster. Lifeblood is not a content pack, but an update. Hope that cleared some things up for you. :)