Having gained Luna's acceptance so easily, the elders of those mysterious clans knew that she would be easy to control. However, they also knew that no matter what tricks Luna tried to use, having her help kill Dyon's father was nothing more than a dream. That man was too intelligent, too cunning, and far too powerful for Luna to be of any use, even in a surprise attack.
In addition, at that point, Luna was still too young and inexperienced, so her abilities were still useless against high level celestials and above. So, despite having questioned Luna about her abilities, they knew she wouldn't be of use here. But, that didn't mean she was useless.
Understanding Luna's abilities, and also knowing that Dyon was that "maniac's" son – as the called him – they quickly devised a plan to control him, through his son, and by proxy Luna. As long as they controlled Luna, they would be able to control Dyon's father!
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