Hyrule Warriors/Palace of Twilight (Cia)

Since Cia's army has arrived, it's clear that Midna and Zant are having a war with each other. While Midna has more space, Zant has less with three bases. How you deal with them will depend on you. Also, you can only choose between Cia and Wizzrobe.

Center of attention
You might want to start off attacking the middle area, full of gibdos and armored fighters until the middle area has been cleared out. Make sure your ally protects Volga and the Allied Base. Not only that, you'll want to take the yellow base on the south east corner to minimize Zant's army. Also, Midna's assault officers will go to your Allied Base so get rid of them quickly to avoid anymore trouble.

Midna or Zant? Who do you choose?
If you decide to take Zant down first, Midna's army would be fired up. But Zant will disappear until you take down not just Midna, but also Agitha as well when Midna orders her army to lock up the castle from middle to the middle west where two bases has been taken. Zant will come back with agnarok on the north side before finally defeating him.

But for a more easy approach, you should attack Midna first, getting Zant's army fired up instead. It's similar with Agitha after Midna's defeat but Zant won't disappear on you.

Zant is escaping!
After you defeat agnarok with the hookshots, Zant will try to run to the Fairy Fountain to escape. You might want to hurry as speed is important. Aim for Zant and take him down before he escapes for real. Don't worry, he'll stop as soon as you attack him first.

He'll give in and decides to go with Cia under submission. Cia is almost done with one more unique detour left: Skyloft.