|activematerial=[[trowel]]Rounded stone|passiveexamine=[[You see an arched wall plan]]|groupM=Build > [[{{PAGENAME}}]]opening|materialsbabel=* 20x [[mortar]]s (40.00 kg)* 20x [[rounded stone]]s|result=* [[{{PAGENAME}}]]|skill=Masonry|requiredskill=30|improveItem=Rounded stone|note=*You must have 1 [[Rounded stone]] and 1 [[mortar]] in inventory to build the wall.R