Need 2 simple keys if you haven't unlocked royal waterways yet, 1 if you have. Explore royal waterways until you get to the junk pit or whatever it's called. Swim over to the left until you find a chained, gold coffin thing. Unlock it with a simple key, and then dream nail the dude that comes out. Go right in the dream realm until reach 3 gold doors, and a caged door. To open the three doors, beat their bosses. Beast tamer and hollow knight not required. Beat those pantheons (1,2, and 3, order doesnt matter). This will unlock the caged one (pantheon 4). Beat this one.
Need 2 simple keys if you haven't unlocked royal waterways yet, 1 if you have. Explore royal waterways until you get to the junk pit or whatever it's called. Swim over to the left until you find a chained, gold coffin thing. Unlock it with a simple key, and then dream nail the dude that comes out. Go right in the dream realm until reach 3 gold doors, and a caged door. To open the three doors, beat their bosses. Beast tamer and hollow knight not required. Beat those pantheons (1,2, and 3, order doesnt matter). This will unlock the caged one (pantheon 4). Beat this one.