Forum:KB:Lightsabers are plasma? (Legends)

So, I've recently seen a lot of stuff on the wiki saying that lightsabers are made of plasma in Legends. I've seen a lot of material that contradicts that, and frankly, I don't think it makes since, either. Could someone please give me a source that says they are? --Vathrain (talk) 05:18, December 5, 2016 (UTC)