Mount Grace was an ancient volcano on Starns, one of the Battle Islands. In 1042 KF Mount Grace was about to errupt. Events like earthquakes, dying plants and acidified water preceded the catastrophe. Evumeimei Dingzai managed to divert the magma spirits to break through the surface at another place, under the Pebbled Sea. Thus the mountain itself didn't errupt, but it still rained ash and made life difficult on Starns for a while.