Каменная U-образная лестница

U-shaped stairs which can be placed on any type of foundation. The stairs are the same height as a wall and can be used to traverse between floors of the building. Stone is a large upgrade over wood granting a large amount of fire, melee, and explosive resistance. The material can withstand up to 2 Timed Explosive Charge. Upgrading a U-shaped staircase to stone quality requires 300 Stone.