Ronnae nodded. "They're elemental essences. We use them a lot for our tech back home. They work much better than conventional batteries I read about in the media library. They tend to last for many years without needing a recharge since they're self-sustaining."

"The essences of fire tend to be the ones used for powering up tech, but there's also essences from the other elements as well as mana and shadow essences. These can also work, but fire's the best for that kind of job, or for more destructive power."