Chapter 18x: Imprisoner of Magic

Objective	Boss	Units allowed	Units gained
Seize the Gate	Aion, Kishuna	12	None
Items droped by emeny	Items that you can steal from enemy		Chest/Village
None	None		Goddess Icon
Initial Enemy		Reinforcements
9 Mage, 7 Knight, 5 Pegasus Knight, 1 Shaman		1 Magic Seal, 2 Sniper, 2 General, 2 Mage, 1 Brigand

Shops:

None

Don't bring a lot of magic users with you for this chapter because a magic seal will appear and make all the magic users pretty much useless. Fight your way around the mountains to the Gate, leave a few units to protect Marlinus from the pegasus knights and mages.
If you visit the Ruins, you'll meet Renault, a bishop who'll join you in the later chapters. For now, he'll give you a Goddess Icon.

Boss Strategy:
Aion: Not hard at all, in fact, he's a sitting duck if the magic seal is on the map since the magic seal nullifies all magic, which means Aion can't attack you with his magic. So the best way is to attack him before you try to attack the magic seal.
Kishuna: If you want the exp, attack him with everyone all together. Magics don't work around him, so use physical weapons. And once you attack him, he'll run away at the end of that turn. But you don't have to kill him to win this chapter.

Reinforcement:
1 Brigand(bottom left corner) before your first turn
1 Magic Seal, 2 Sniper, 2 General,(fortress near the gate) after your 3rd turn
2 Mage(fortress near where you started) after enemy's 8th turn