Today I was playing a game and I had an event that popped that converted all previously dead worlds into either a thulium or promethion deposit. That was great except for now there are no more dead worlds. So therefore the Kiln of Worlds Artifact is useless as I'm unable to convert thulium or promethion worlds with the Kiln of Worlds. A simple fix would be to allow the Kiln of Worlds to convert Thulium/Promethion planets as well, which one normally wouldn't do most likely unless they got this event. An alternative fix would be to limit the event that changes them all to Thulium or Promethion planets to only convert 50% random ones instead of all. Or even a better transition would be to create new Thulium or Promethion planets randomly around stars.
Right now I'm no where near the end of my game and now one artifact is gone