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Tasier was having some difficulties in making his internal Lightning Energy compatible with External Lightning Element. It's not that he doesn't have a talent for it, it's just that he got too used to his own way of doing things. He then asked Krune if there was a way to keep using his own lightning only, but Krune was merciless.
"If you can't do even this least bit, then you can go away! This is nothing more than laziness from your part. If I say it's possible, then it's possible. Lofa was a much better student than you, she didn't complain about anything I said and tried all be herself. Are you telling me that a mighty Thunder Hawk Demon Beast can't even do as much?"