Hi. I'm looking for a substance that could be used to draw dark energy from space and power very large spaceships. Ideally, it would be something real but rare on Earth. I was using a made-up mineral called sparkle, but I found that using something made up didn't feel right, otherwise why hasn't it been found on Earth yet? I'm also considering tritium, but I read that its natural state is a gas with a very short half-life. Star Wars uses plasma, so I'm trying to avoid that. Star Trek uses anti-matter, so I'm also avoiding that. Should I use a rare gem to draw/focus dark energy?