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Kireina made sure to extend her domain all around the capital. This was because she wanted to give her wives a large space to fight.
She was requested this by her wives before the entire city was brainwashed, as most of them desired to fight a strong opponent and develop their new abilities, especially those that had recently evolved. After considering it for a while, Kireina accepted their request, however, she granted each of them a large quantity of Slime Clones protecting them inside of their equipment alongside coating their weapons with the effects of Divinity Devouring a dozen times.
If they were to fight Geggoron's split souls, he would ultimately overpower the girls. Geggoron's split souls had special Divine Energy Techniques that could easily regenerate wounds on its vessel endlessly.
Check "The Protagonist's Sister Is Actually the Strongest"!