Here is my screenshot: file:///C:/Users/User/YandexDisk/%D0%A1%D0%BA%D1%80%D0%B8%D0%BD%D1%88%D0%BE%D1%82%D1%8B/2015-08-14%2007-54-47%20%D0%A1%D0%BA%D1%80%D0%B8%D0%BD%D1%88%D0%BE%D1%82%20%D1%8D%D0%BA%D1%80%D0%B0%D0%BD%D0%B0.png
Here is my screenshot: file:///C:/Users/User/YandexDisk/%D0%A1%D0%BA%D1%80%D0%B8%D0%BD%D1%88%D0%BE%D1%82%D1%8B/2015-08-14%2007-49-12%20%D0%A1%D0%BA%D1%80%D0%B8%D0%BD%D1%88%D0%BE%D1%82%20%D1%8D%D0%BA%D1%80%D0%B0%D0%BD%D0%B0.png
 "GrindCraft"){kind=icon}
 "Ballistic"){kind=icon}
 "Command & Control"){kind=icon}
yeah. obsidian flying knight is not used up. but it is required to fight parts of the dragon.