Secret chambers can sometimes be found while exploring a dungeon floor, when exploring a small section of the wall will have a sparkle effect/ little yellow stars glimmer on it, if you walk in to that section a hidden room will appear.Secret Chamber do not appear on the map unless found in person using a Vision Scroll won't show them either.In these secret chamber you will find a Blue chest that requires 50 Diamonds/Crystals to open, a normal chest like the ones found all over the dungeon and a gold pot.The stair case in the room leads directly to the next floor.