Luke's hand went to the crystal. "I made it. Natural kyber are just about impossible to get hold of in my time, so when I had to make a new lightsaber, I had to make a synthetic one."

Yeah, the type that frequently caused lightsabers to explode.

"They took my actual lightsaber, but I'm working on a replacement now. I just need to find something sensitive enough to handle the energy fluctuations without burning out doing so. I've done it before, I can again, it's just annoying."