The Staircase is a craftable item used to instantly create a ladder that leads down one level in The Mines or Skull Cavern. It cannot be placed on level 0 or 120 of the mines. Staircases work just like the game-supplied down-ladders. Each one works only for one use.

Can I use staircases in skull cavern?

Staircases can be crafted with 99 stone, or by trading one Jade to the Desert Trader on Sundays. These staircases create an immediate entry point to the next level of the mines. Stack a ton of Stone and bring it to Skull Cavern, as you'll be able to use it to descend quickly or escape tough monster fights.

What is the fastest way to descend the skull cavern?

Simply place a Mega Bomb in a group of rocks and you should get a stair case. Then, when you get to the floors with tonnes of Iridium ore, simply blow them up with a Mega Bomb to collect them quickly.