Weak Mossy Betweenstone Tiles is a unique trap block found flooring the second level of the Wight Fortress. The block has the appearance of an extremely cracked version of Mossy Betweenstone Tiles. When walked on by the player, it has a chance to 'fall' to the floor below, breaking the second floor and making the player fall through if they are not careful. If enough of them are broken, this will require the player to walk along the wall parts of the corridors to progress through the fortress. Do note if you try to mine it that it is protected by the fortress.