Larian Studios Forums Beyond Divinity (English) Help/Tips/Tricks Act 4 dungeon key 6

I have found the 6th dungeon but I have no key for it. None of the Act 4 maps show the location of a key 6. Where do I look?

Have you been in the end level? Killed the demon there? The NW room shows a golden chest => there is a BF key. But IIRC, just a joker key. I have never found key 6.
Kiya