Upon placing your [Ethereal Stones] here, 4 soldiers of stone spawn, note the doors the outer 3 are standing near, then note in which order you kill those 3 and after the fight walk through the doors in the same order. - This is a group update, so let 1 player do it. - Passing the test severs the plane's link to the Ethereal Stones, so that you can take some [Severed Ethereal Stones] needed for the Council of Stone.