Fire Emblem: The Sacred Stones/Final Chapter: Sacred Stones

Part 1: Kill the miniboss dragons with myrrh, then slowly make your way to lyon. Killing him and his guards can be quite a feat, but nevertheless, it needs to get done.

Part 2: All of the units i brought into this battle except eirika, ephraim, and seth died the first time i played this game. Stay out of the range of fomortiis and kill the monsters he summons, then advance on him with everyone who has a legendary weapon or a dragonstone equipped. With a bit of luck, he should go down easily.