Why did Leader Twilight Star call a council meeting?

When the reason stood in front of them as a mysterious teenage boy, everyone was awestricken. The last time there was a male council member was 300 years prior, and on top of that, the Maple Clan was made up of various elements. The only way someone could enter a clan was if people in that clan harnessed the same element, and no one had the power Nightfall had. The only person who knew where Nightfall came from before he arrived at the village was Twilight. Well, she thought she knew . .