|activematerial=[[trowel]]sandstone brick|passiveexamine=[[You see an arched wall plan]]|groupM=Build > [[{{PAGENAME}}]]|materials=* 20x [[mortar]]s (40.00 kg)* 20x [[Sandstone brick]]s|result=* [[{{PAGENAME}}]]|skill=Masonryopening|requiredskillbabel=30|improveItem=Sandstone brick|note=*You must have 1 [[Sandstone brick]] and 1 [[mortar]] in inventory to build the wall.S