__TOC__ Forced items For every special room there is something to open or used to get an item. This tip will help you guess what kind of potion you have in your backpack. * There is a Potion of Invisibility for each Flooded vault at a depth. * There is a Potion of Liquid Flame for each Storage at a depth. * There is a Potion of Levitation for each Room of traps, or Chasm room, at a depth. * There is an Iron key for each locked door at a depth. * There is a Golden key for each locked chest & each pair of crystal chests at a depth.