Magic condenser... magic battery? Luka supposes it makes sense. Some method to amplify magic abilities, he assumes, and so he nods as though he completely understands.

"For me?" Eleven's addendum catches Luka by surprise. His own use of magic had been haphazard at best, and it had always felt like something out of his control. Though it had never backfired on him yet, Luka's unsure if amplifying something he barely understood how to use was the best idea.

"I guess we need all the additional power we can get." He says, his uncertainty hinted in his demeanor. "But I've never been so great with magic."