I am have a Thunderlord Van and have collected the seven spheres twice already. I have currently collected six and trying to complete my third set. Before, I would face a High King with a sphere every 5-6 matches or so. I also ran into Dural several times and collected spheres from her. But since I have reached this point (one sphere left to obtain) I have not gotten a sphere in some 30+ matches. I am running into the same High Kings, but with no spheres to collect. I also have not run into Dural again for quite a while. Is there some criteria that I am not fufilling? Do I have to be a specific rank? Any help would be appreciated. Thanks.