The Ghosts of Bern

The Ghost of Bern is chapter 23 of Fire Emblem: Fūin no Tsurugi. This Chapter can only be accessed if the player had all the legendary weapons at the end of The Neverending Dream. This chapter can be a difficult, since there is a large number of enemies, including a Druid with Sleep Staff near Brunya, the boss of this chapter. Be sure to bring strong, fast units with high HP and defense, so that they can kill the enemies here. At first some wyverns will storm you from the north, while the archers in the little isle in the middle of the lake will attack you with the ballistae. Brunya is guarding the entrance to the Dragon temple, where Idenn is located.

If you visit the village with Fir, you will be joined by Karel, the Lv. 19 swordmaster