ChinaFE: WoGaE, Final Chapter, Part 1
Finally, here we are, at the end of the game.
Units used:
Eirika, Ephraim, Brenya, Sonia, Limstella, Nergal, Hellene, Fiora, Amelia, Young Guinevere, Cecilia, and Clarine.
This chapter is actually fairly easy compared to the other chapters leading up to. Your only problems should be the Gwyllgis and Draco Zombies. Other than that, you should be able to extinguish Lyon's forces quite easy. Bring every sacred weapon your units can use with you (except for maybe Latona or Gleipnir)
Obviously you'll be splitting up your army into two teams of six. Just like in the original FE8, once you exit the hallways on either side of the map and enter the area where the Draco Zombies (and a couple Gwyllgi) wait for you, it will trigger reinforcements on the other side of the map. Make sure to unlock the chests and turn one of your remaining female Sages into a Queen. Don't go up the central staircase because 1) there's Gwyllgi there that won't move otherwise and 2) it triggers spawns behind Lyon.
When you face Lyon, just pelt him with even Sacred Twin you can, and he should fall pretty easily.
Formitiis is much the same, except you'll want to beat him before he gets a second turn to move. His first turn is like a freebie, since he only summons monsters. So, throw caution to the wind and rush him. Remember: Excalibur's better than Invaldi, Mani Katti's better than Adhulma, and dark magic is pretty useless.